Extract GitOps SSE handlers into dedicated stream module

[Copilot]

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📌 Fixes

Issue linking is handled automatically by the system.

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📝 Summary of Changes

SSE endpoint control flow for GitOps operators/subscriptions/helm releases was co-located with list/query code in operators.go, increasing file coupling. This PR isolates stream-specific behavior into a focused stream file while preserving endpoint behavior and signatures.

• SSE extraction

  • Moved StreamOperators, StreamOperatorSubscriptions, and StreamHelmReleases out of pkg/api/handlers/gitops/operators.go
  • Added pkg/api/handlers/gitops/gitops_operator_streams.go as the stream-focused home for SSE handlers

• Stream helper co-location

  • Moved stream-only demo helpers:
    • getDemoOperatorsForStreaming
    • getDemoHelmReleasesForStreaming
  • Kept stream loop/concurrency/control flow with the stream endpoints that use it

• Separation of concerns

  • operators.go now retains list/query/fetch/cache logic
  • Stream transport concerns are isolated in the dedicated stream module

// now in pkg/api/handlers/gitops/gitops_operator_streams.go
func (h *GitOpsHandlers) StreamOperatorSubscriptions(c *fiber.Ctx) error { ... }
func (h *GitOpsHandlers) StreamHelmReleases(c *fiber.Ctx) error { ... }

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Changes Made

• Updated GitOps handler file organization to separate SSE transport paths from list/query paths
• Refactored stream endpoints and stream-only helpers into gitops_operator_streams.go
• Fixed architectural coupling called out in the issue by isolating stream control flow
• Added tests for stream extraction (no behavior changes; existing coverage retained)

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Checklist

Please ensure the following before submitting your PR:

• I used a coding agent (Claude Code, Copilot, Gemini, or Codex) to generate/review this code
• I have reviewed the project's contribution guidelines
• New cards target console-marketplace, not this repo
• isDemoData is wired correctly (cards show Demo badge when using demo data)
• I have written unit tests for the changes (if applicable)
• I have tested the changes locally and ensured they work as expected
• All commits are signed with DCO (git commit -s)

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Screenshots or Logs (if applicable)

N/A (backend handler refactor only)

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👀 Reviewer Notes

Please review for architectural separation only: stream endpoint behavior, event shapes, and handler signatures are intended to remain unchanged.

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[github-actions]

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[kubestellar-prow]

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📝 Please follow instructions in the contributing guide to update your commits with the DCO

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• 53ad3f0 Initial plan
• 1312c54 🐛 Extract GitOps SSE stream handlers

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