feat: support setting metadata.annotations

[porridge]

Needed for https://redhat.atlassian.net/browse/ROX-36583 which sets platform.stackrox.io/managed-services: true.

I only added annotations for now, as overriding all of metadata could lead to "creative" but fragile uses.

Tested in another PR.

Summary by CodeRabbit

• New Features
  • Central and SecuredCluster configurations now support structured metadata with optional annotations.
  • Custom resources created from these configurations retain existing metadata while applying specified annotations and specifications.
  • Metadata handling provides more consistent results when updating deployed resources.

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• internal/deployer/config.go

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• internal/deployer/config.go

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📝 Walkthrough

Walkthrough

The change replaces MetadataAnnotations with nested CRMetadata in Central and SecuredCluster configuration. Custom-resource builders merge metadata through CRMetadata.toMap() and update merge error messages.

Changes

Metadata configuration

Layer / File(s)	Summary
Metadata contract and custom-resource merging internal/deployer/config.go	CentralConfig and SecuredClusterConfig now use Metadata CRMetadata. CRMetadata contains an annotations map. Both custom-resource builders merge metadata through CRMetadata.toMap() and update merge error messages.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 35ed3

This change adds annotation configuration for Central and SecuredCluster custom resources without enabling broad metadata overrides. No current merge-blocking risk is identified.

Suggested reviewers: mclasmeier

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: support for setting metadata.annotations.

✨ Finishing Touches

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Actionable comments posted: 1

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Inline comments:
In `@internal/deployer/config.go`:
- Around line 330-333: Update the DeepMerge inputs in both CustomResource
methods so metadata is represented as a nested map and annotations are merged as
a map rather than passing CRMetadata structs. Preserve name, namespace, and
labels, emit lowercase metadata.annotations, and add regression tests covering
both resources.

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• internal/deployer/config.go

Included review availability: Your plan provides up to 12 included reviews per hour; 11 remain after this review.