Refactor status collector architecture with structured errors

[dmartinol]

Fixes #2004

• Split the monolithic Collector interface with SyncStatusCollector and APIStatusCollector to pass only the needed one to the processing methods
• Use an Error type to transport condition and phase information to the root, instead of a generic error
• This way, the low-level methods do not need the collectors because they raise the error that carries the desired information

This change is needed to solve #1749 for error paths: some more changes may needed to fix the e2e tests.

[codecov]

Codecov Report

❌ Patch coverage is 26.05364% with 193 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.85%. Comparing base (417c167) to head (0efa38f).

Files with missing lines	Patch %	Lines
...ator/pkg/mcpregistrystatus/mocks/mock_collector.go	0.00%	77 Missing ⚠️
...thv-operator/controllers/mcpregistry_controller.go	0.00%	62 Missing ⚠️
cmd/thv-operator/pkg/sync/manager.go	23.80%	32 Missing ⚠️
cmd/thv-operator/pkg/registryapi/manager.go	0.00%	17 Missing ⚠️
...thv-operator/pkg/registryapi/mocks/mock_manager.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2016      +/-   ##
==========================================
- Coverage   47.91%   47.85%   -0.07%     
==========================================
  Files         233      235       +2     
  Lines       29172    29226      +54     
==========================================
+ Hits        13979    13985       +6     
- Misses      14165    14215      +50     
+ Partials     1028     1026       -2     

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