Rollout: resolve_merge_conflicts_flow feature flag
## Summary Feature flag rollout issue for `resolve_merge_conflicts_flow`, which gates the Resolve Merge Conflicts foundational flow. Related to #588529 and &20688. ## Rollout plan - [ ] Enable on staging - [ ] Enable on GitLab.com for internal projects - [ ] Enable percentage rollout (10% → 25% → 50% → 100%) - [ ] Verify metrics and error rates at each stage - [ ] Remove feature flag and clean up
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