Fix VirtualMCPServer OIDC configuration by implementing OIDCConfigurable interface

[jhrozek]

Summary

VirtualMCPServer with type: kubernetes or type: configMap OIDC configuration was not working because the converter used hand-rolled conversions instead of implementing the pre-existing OIDCConfigurable interface that the OIDC resolver requires.

This PR:

• Implements OIDCConfigurable interface on VirtualMCPServer (adds GetOIDCConfig() and GetProxyPort() methods)
• Refactors Converter to require an OIDC resolver and use it for all OIDC types (kubernetes, configMap, inline)
• Ensures fail-closed behavior: if OIDC resolution fails, deployment fails rather than silently deploying without authentication
• Adds comprehensive tests using gomock for OIDC resolution

Changes

1. Add mockgen directive for OIDC Resolver - Enables proper unit testing with mock resolvers
2. Implement OIDCConfigurable on VirtualMCPServer - Adds the interface methods needed by the OIDC resolver
3. Refactor Converter to use OIDC resolver - Removes hand-rolled inline-only handling and uses the unified resolver for all OIDC types

Test plan

• Unit tests pass for all OIDC config types (kubernetes, configMap, inline)
• Fail-closed behavior verified: resolver errors cause conversion to fail
• Existing tests updated to use mock resolver
• Manual testing with kubernetes OIDC type in a real cluster

Fixes #2820

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 77.35849% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.65%. Comparing base (f57d84a) to head (eeb373e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...hv-operator/api/v1alpha1/virtualmcpserver_types.go	0.00%	6 Missing ⚠️
cmd/thv-operator/pkg/vmcpconfig/converter.go	90.69%	2 Missing and 2 partials ⚠️
...perator/controllers/virtualmcpserver_vmcpconfig.go	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## main #2821 +/- ## ========================================== + Coverage 56.59% 56.65% +0.05%  ========================================== Files 322 322 Lines 31247 31279 +32 ========================================== + Hits 17685 17721 +36  + Misses 12042 12040 -2  + Partials 1520 1518 -2 

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