Properly convert action field to IRI event

[friegger]

Summary by CodeRabbit

• Bug Fixes
  • Event listings now include the event action value as part of the ListEvents response payload, making event details complete and consistent across both unfiltered and filtered results.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 9a8a4a63-8dcb-443c-81e2-8293043606a6

📥 Commits

Reviewing files that changed from the base of the PR and between 0f2b5be and 59b266b.

📒 Files selected for processing (2)

• internal/controllers/controllers_suite_test.go
• internal/server/integration/server_integration_suite_test.go

✅ Files skipped from review due to trivial changes (1)

• internal/server/integration/server_integration_suite_test.go

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📝 Walkthrough

Walkthrough

This PR populates EventSpec.Action in ListEvents responses, updates integration tests to assert the new field, and changes two integration test suite image constants to a pinned Gardenlinux KVM reference.

Changes

Event Action field propagation

Layer / File(s)	Summary
Populate and verify Action field internal/server/event_list.go, internal/server/integration/event_list_test.go	convertEventToIRIEvent now sets Action on EventSpec, and ListEvents integration tests assert Action equals SetIgnition in both filter scenarios.

Integration test image pinning

Layer / File(s)	Summary
Pin test OS image references internal/controllers/controllers_suite_test.go, internal/server/integration/server_integration_suite_test.go	Both suite-level osImage constants switch from unpinned latest image references to ghcr.io/ironcore-dev/gardenlinux/gardener:2150.4.0-kvm.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	No pull request description was provided, so the required template sections and issue reference are missing.	Add the required Proposed Changes section with the three bullet points and include the Fixes # issue reference.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: populating the action field when converting events to IRI events.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ironcore-1489-set-action-field-when-converting-to-iri-event

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