Implement VM Live Migrations

[nesitor]

Feature: Implement Live migration support on CRNs. It includes 2 new endpoints to manage the VM live migration between CRNs, moving memory and disk data between hosts.

Self proofreading checklist

• The new code clear, easy to read and well commented.
• New code does not duplicate the functions of builtin or popular libraries.
• An LLM was used to review the new code and look for simplifications.
• New classes and functions contain docstrings explaining what they provide.
• All new code is covered by relevant tests.
• Documentation has been updated regarding these changes.
• Dependencies update in the project.toml have been mirrored in the Debian package build script packaging/Makefile

Changes

Implemented this workflow:

Scheduler                               Destination CRN                                                                                                                                                  
---------                               ---------------                                                                                                                                                  
1. POST /control/migrate                                                                                                                                                                                 
- Auth: X-Auth-Signature                                                                                                                                                               
- Body: {vm_hash, migration_port}                                                                                                                                                                        
- Fetch message, validate                                                                                                                                                                                
- Create destination disk image                                                                                                                                                                          
- Setup network (TAP, firewall)                                                                                                                                                                          
- Start QEMU with -incoming flag                                                                                                                                                                         
- Return {status: "ready", migration_host, migration_port}                                                                                                                                               
                                                                                                                                                                                                         
Scheduler                               Source CRN                                                                                                                                                       
---------                               -----------                                                                                                                                                      
2. VM Running                                                                                                                                                                                            
                                                                                                                                                                                                         
3. POST /control/machine/{ref}/migration/start                                                                                                                                                           
- Auth: X-Auth-Signature                                                                                                                                                           
- Body: {destination_host, destination_port}                                                                                                                                                             
- Validate running VM                                                                                                                                                                                    
- Send QMP migrate command  --> Destination receives data                                                                                                                                                
(migrate -d -b -i)            (memory + disk)                                                                                                                                                            
- VM resumes execution                                                                                                                                                                                   
- Auto-reconfigure guest network IP                                                                                                                                                                      
                                                                                                                                                                                                         
4. Source VM auto-stopped & cleaned up                                                                                                                                                                   

[codecov]

Codecov Report

❌ Patch coverage is 80.16726% with 166 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.35%. Comparing base (4dbda19) to head (d0f4b1f).

Files with missing lines	Patch %	Lines
src/aleph/vm/orchestrator/views/migration.py	48.83%	127 Missing and 5 partials ⚠️
src/aleph/vm/pool.py	5.00%	19 Missing ⚠️
src/aleph/vm/controllers/configuration.py	45.45%	6 Missing ⚠️
src/aleph/vm/hypervisors/qemu/qemuvm.py	66.66%	1 Missing and 2 partials ⚠️
src/aleph/vm/controllers/qemu/instance.py	75.00%	1 Missing and 1 partial ⚠️
src/aleph/vm/controllers/qemu/client.py	98.52%	0 Missing and 1 partial ⚠️
...aleph/vm/controllers/qemu_confidential/instance.py	50.00%	1 Missing ⚠️
src/aleph/vm/models.py	92.85%	0 Missing and 1 partial ⚠️
src/aleph/vm/orchestrator/views/operator.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #866      +/-   ##
==========================================
+ Coverage   66.14%   67.35%   +1.20%     
==========================================
  Files          89       92       +3     
  Lines        8815     9635     +820     
  Branches      781      834      +53     
==========================================
+ Hits         5831     6490     +659     
- Misses       2748     2897     +149     
- Partials      236      248      +12     

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