feat(webapp): add region override to the bulk replay action

[matt-aitken]

Summary

When replaying runs in bulk from a deployed environment, you can now choose which region the replayed runs run in. The bulk action inspector shows an "Override region" dropdown that defaults to "Don't override", which keeps each run in its original region, so replaying a selection that spans multiple regions doesn't silently re-route anything. Pick a region and every matched run is replayed there instead.

The dropdown only appears for the replay action in a deployed environment with more than one region available; cancel actions and development environments don't show it.

Design

The selected region is carried through the bulk action as a dedicated replayRegion param, kept separate from the run-list selection filters so it can't be confused with a region selection filter. When the action runs, each replay passes it through to the existing region override on the replay service, which already falls back to each run's original region when no override is set. "Don't override" is a sentinel value that the action normalizes away so the service only ever sees a real region or nothing.

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Latest commit: 17990e0

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Walkthrough

The pull request adds an optional "Override region" feature to bulk replay actions. BulkActionService.create now computes a replayRegion from the incoming payload and persists it within the params object stored in the database. BulkActionService.process reads this value back and passes it as the region argument to ReplayTaskRunService. On the route side, the loader is updated to fetch available regions via RegionsPresenter in parallel with the existing presenter, a sentinel constant (REPLAY_REGION_NO_OVERRIDE_VALUE) is introduced for the "no override" state, and the CreateBulkActionPayload Zod schema gains an optional region field. The action normalizes the sentinel to undefined before calling the service. The UI conditionally renders a region dropdown when the selected action is replay, the environment is not DEVELOPMENT, and more than one region exists.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main feature addition: a region override capability for bulk replay actions in the webapp.
Description check	✅ Passed	The description provides comprehensive context about the feature, design decisions, and implementation details, but lacks explicit coverage of all template sections like testing steps and checklist items.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/bulk-replay-region

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