optimize: cache common entity lookups in CallContext during VM deployment

[shwstppr]

Description

This is a long-shot idea and may need some discussion. In my brief testing, a single VM deployment took over 250 DB queries.

This change introduces caching of frequently accessed entities in CallContext to reduce repeated database lookups during VM deployment. By reusing cached values for common entries, the deployment workflow becomes more efficient, reducing overhead and improving overall performance.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• build/CI
• test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[codecov]

Codecov Report

❌ Patch coverage is 40.00000% with 123 lines in your changes missing coverage. Please review.
✅ Project coverage is 17.56%. Comparing base (5f9e131) to head (8c162a3).

Files with missing lines	Patch %	Lines
...a/com/cloud/network/router/CommandSetupHelper.java	20.00%	28 Missing ⚠️
...c/main/java/com/cloud/utils/db/GenericDaoBase.java	0.00%	19 Missing ⚠️
...om/cloud/network/element/VirtualRouterElement.java	23.80%	16 Missing ⚠️
.../apache/cloudstack/context/RequestEntityCache.java	47.82%	5 Missing and 7 partials ⚠️
...ain/java/com/cloud/storage/StorageManagerImpl.java	44.44%	10 Missing ⚠️
...n/java/com/cloud/capacity/CapacityManagerImpl.java	0.00%	8 Missing ⚠️
...om/cloud/deploy/DeploymentPlanningManagerImpl.java	80.95%	5 Missing and 3 partials ⚠️
...torage/allocator/AbstractStoragePoolAllocator.java	0.00%	4 Missing ⚠️
...n/java/com/cloud/vm/VirtualMachineManagerImpl.java	40.00%	3 Missing ⚠️
...ava/org/apache/cloudstack/context/CallContext.java	50.00%	2 Missing ⚠️
... and 7 more

Additional details and impacted files

@@            Coverage Diff             @@
##               main   #11549    +/-   ##
==========================================
  Coverage     17.55%   17.56%            
- Complexity    15537    15550    +13     
==========================================
  Files          5910     5911     +1     
  Lines        529336   529441   +105     
  Branches      64654    64671    +17     
==========================================
+ Hits          92904    92971    +67     
- Misses       425975   425986    +11     
- Partials      10457    10484    +27     

Flag	Coverage Δ
uitests	3.58% <ø> (ø)
unittests	18.62% <40.00%> (+<0.01%)	⬆️

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[github-actions]

This pull request has merge conflicts. Dear author, please fix the conflicts and sync your branch with the base branch.