feat: implement grpc security options consistent with service pack releases

[iboyd-ansys]

Following recent service packs for 24.2, 25.1 and 25.2, the gRPC client in System Coupling now requires new explicit command line arguments to specify the gRPC transport options. The new default in PySystemCoupling is to use a secure transport option.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.46154% with 161 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.30%. Comparing base (8493a3a) to head (e4b573c).
⚠️ Report is 1 commits behind head on main.

❌ Your patch status has failed because the patch coverage (50.46%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #555      +/-   ##
==========================================
- Coverage   85.21%   81.30%   -3.92%     
==========================================
  Files          43       44       +1     
  Lines        2686     2984     +298     
==========================================
+ Hits         2289     2426     +137     
- Misses        397      558     +161     

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[Copilot]

Pull request overview

This PR implements gRPC security options to align with service pack releases for System Coupling versions 24.2, 25.1, and 25.2. The main change is introducing secure transport as the new default for gRPC connections, with fallback mechanisms for older versions.

• Adds new ConnectionType enum and grpc_transport.py module to manage different gRPC connection modes (secure local, insecure, mTLS, UDS, WNUA)
• Updates default connection behavior to use secure local connections with automatic fallback for service pack versions
• Modifies test infrastructure to use service pack images (e.g., v25.2.0-sp03) instead of base releases

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/ansys/systemcoupling/core/client/grpc_transport.py	New module implementing connection type management and gRPC transport configuration
src/ansys/systemcoupling/core/client/grpc_client.py	Integrates new connection type system, adds retry logic for channel readiness, and updates connection handling
src/ansys/systemcoupling/core/client/syc_process.py	Refactored to support new command-line argument formats with fallback mechanism for older versions
src/ansys/systemcoupling/core/client/syc_container.py	Updates container startup to handle service pack versions and select appropriate transport arguments
src/ansys/systemcoupling/core/init.py	Adds connection_type parameter to launch() and connect() functions
src/ansys/systemcoupling/core/syc_version.py	Enhanced to handle version strings with "v" prefix
tests/conftest.py	Adds image_tag_env fixture to provide default service pack version for local testing
tests/*.py	Updates test functions to include image_tag_env fixture parameter
.github/workflows/ci.yml	Updates CI to use service pack versions for testing
.github/actions/generate-api/action.yml	Adds disk cleanup step before pulling docker images

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