Add pin-policy-bundle acceptance tests for TA task

[joejstuart]

Summary

• Add pin-policy-bundle step log assertion to the existing "Golden container image with trusted artifacts" scenario (no-op path: policy uses git sources, OCI tag not found)
• Add new "Pin policy bundle digest" scenario for verify-conforma-konflux-ta task (replacement path: OCI tag replaced with digest-pinned reference)
• Add corresponding snapshot entries

These mirror the two pin-policy-bundle scenarios already covered by the verify-enterprise-contract task, closing a gap where the TA task variant had zero dedicated coverage for this step.

Test plan

• Acceptance tests pass for ta_task_validate_image feature

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Enterprise

Run ID: 09e5acf5-5aa2-45ff-a515-8da6cb82a834

📥 Commits

Reviewing files that changed from the base of the PR and between 8aec709 and 36c805b.

⛔ Files ignored due to path filters (1)

• features/__snapshots__/ta_task_validate_image.snap is excluded by !**/*.snap

📒 Files selected for processing (1)

• features/ta_task_validate_image.feature

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
acceptance	55.60% <ø> (ø)
generative	17.82% <ø> (ø)
integration	26.56% <ø> (ø)
unit	69.04% <ø> (ø)

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[joejstuart]

/retest