Fix reconciliation loops

[dmartinol]

Fix #1916

Note: The issue became even more relevant with the introduction of the Registry API, because a single phase field was trying con condense the reconciliation state of both the sync and API deployment processes. By dividing the phase in 2 distinct fields we can ensure consistent execution of the needed steps and skip those already completed.

• Added separate SyncStatus and APIStatus with dedicated phase enums
• Implemented phase derivation logic
• Update status collector to handle nested status fields
• Fix infinite reconciliation loops by making sync manager status-aware
• Add conditional status updates to prevent unnecessary Kubernetes API calls (e.g. when the K8s Service spec does not change)
• Update printer columns to show separate sync and API phases

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 32.78237% with 244 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.27%. Comparing base (040f5cf) to head (a69eef5).

Files with missing lines	Patch %	Lines
...thv-operator/controllers/mcpregistry_controller.go	0.00%	144 Missing ⚠️
...thv-operator/api/v1alpha1/zz_generated.deepcopy.go	0.00%	39 Missing ⚠️
...md/thv-operator/pkg/mcpregistrystatus/collector.go	63.82%	17 Missing ⚠️
...ator/pkg/mcpregistrystatus/mocks/mock_collector.go	0.00%	16 Missing ⚠️
cmd/thv-operator/pkg/registryapi/manager.go	64.28%	9 Missing and 1 partial ⚠️
cmd/thv-operator/pkg/registryapi/service.go	0.00%	10 Missing ⚠️
cmd/thv-operator/pkg/sync/manager.go	81.08%	5 Missing and 2 partials ⚠️
cmd/thv-operator/api/v1alpha1/mcpregistry_types.go	96.42%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1996      +/-   ##
==========================================
- Coverage   47.42%   47.27%   -0.15%     
==========================================
  Files         232      232              
  Lines       28644    28915     +271     
==========================================
+ Hits        13583    13671      +88     
- Misses      14039    14226     +187     
+ Partials     1022     1018       -4     

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[jhrozek]

The only place where I feel like we should improve the code is the nil dereference, the others are nits that can be fixed later.