Refactors ConfigMap management in the Operator to use reusable configmaps package

[ChrisJBurns]

Consolidated ConfigMap upsert logic into pkg/kubernetes/configmaps package across 5 locations.

Deleted Files

• pkg/runconfig/configmap/configmap.go + tests
• pkg/registryapi/config/configmap.go + tests

Refactored Controllers

File	Change
controllers/mcpserver_runconfig.go	Use configmaps.Client directly
controllers/mcpremoteproxy_runconfig.go	Removed ensureRunConfigConfigMapResource (~50 lines)
controllers/virtualmcpserver_vmcpconfig.go	Removed ensureVmcpConfigConfigMapResource (~50 lines)
pkg/registryapi/manager.go	Use configmaps.Client directly
pkg/controllerutil/authz.go	Removed manual Get/Create/Update in EnsureAuthzConfigMap (~25 lines)

Simplified Interfaces

• pkg/registryapi/config/ConfigManager: Removed UpsertConfigMap method, simplified NewConfigManager to single parameter

Checksum Handling

The previous implementations manually compared checksum annotations to detect changes before updating ConfigMaps. This logic has been removed because controllerutil.CreateOrUpdate (used internally by configmaps.Client) already compares the existing and desired resources to detect differences. It only performs an update when the content has actually changed, making the manual checksum comparison redundant. The checksum annotations are still added to ConfigMaps for use by pod template annotations to trigger rollouts when config changes.

Benefits

• ~150 lines of duplicate Get/Create/Update logic removed
• Centralized ConfigMap operations with controllerutil.CreateOrUpdate for atomic operations
• Consistent owner reference handling across all controllers

Large PR Justification

• It's mostly removing files and code in favour of reusable functions

[github-actions]

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## Large PR Justification

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.44%. Comparing base (6053cdc) to head (59ea053).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/thv-operator/pkg/controllerutil/authz.go	0.00%	3 Missing ⚠️
...v-operator/controllers/mcpremoteproxy_runconfig.go	66.66%	1 Missing and 1 partial ⚠️
...perator/controllers/virtualmcpserver_vmcpconfig.go	33.33%	1 Missing and 1 partial ⚠️
...md/thv-operator/controllers/mcpserver_runconfig.go	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3021      +/-   ##
==========================================
- Coverage   56.49%   56.44%   -0.06%     
==========================================
  Files         335      333       -2     
  Lines       33171    33001     -170     
==========================================
- Hits        18741    18626     -115     
+ Misses      12836    12793      -43     
+ Partials     1594     1582      -12     

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[github-actions]

✅ Large PR justification has been provided. The size review has been dismissed and this PR can now proceed with normal review.

Large PR justification has been provided. Thank you!