backend/fix: implement withForkCounters in the cluster pipeline test monad

[piyushKumar-1]

What

Adds withForkCounters _ _ action = action to the CoreMetrics instance of TestM in test/src/HedisClusterPipeline.hs.

Why

0a8170e9 added withForkCounters to the CoreMetrics class without a default. #1516 was based on the commit before it and added a CoreMetrics instance for the Redis cluster test monad that doesn't define it. Both merged cleanly on their own, but together mobility-core-tests fails with -Wmissing-methods under -Werror. Only the test suite is affected; the library is unchanged.

TestM's metrics are all no-ops, so withForkCounters just runs the action. No other CoreMetrics instance in the repo is missing the method.

Summary by CodeRabbit

• Tests
  • Updated the test environment to support fork-counting metrics without changing test behavior.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: d7c87a85-ec95-4a0f-bf8f-c656c3632905

📥 Commits

Reviewing files that changed from the base of the PR and between ea37819 and 436fbda.

📒 Files selected for processing (1)

• lib/mobility-core/test/src/HedisClusterPipeline.hs

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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Walkthrough

The Metrics.CoreMetrics TestM instance now implements withForkCounters as a no-op. It returns the supplied action unchanged.

Changes

Test Metrics Support

Layer / File(s)	Summary
No-op fork counter implementation lib/mobility-core/test/src/HedisClusterPipeline.hs	The TestM metrics instance implements withForkCounters and returns the action unchanged.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 436fb

This test-only change completes the metrics stub without changing runtime behavior.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: implementing withForkCounters in the cluster pipeline test monad.
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 0…
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 unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch backend/fix/test-core-metrics-fork-counters

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_{A rabbit counts no forks today
The test path keeps its quiet way
Metrics pause, the action runs
No extra counters chase the buns
The stub now fits the meadow’s code}

_{Comment @coderabbitai help to get the list of available commands.}