Owen Lin 90c67e6f33
Classify rollout migration failures ( #39784 ) ...
## Why
Rollout migration outcomes expose free-form error messages, making failures hard to group without parsing text.
## What changed
- Add a serialized `RolloutMigrationFailureReason` to failed outcomes and classify failures across reading, conversion, SQLite materialization, publishing, and recovery.
- Add the failure reason as a low-cardinality tag on per-thread migration telemetry.
## Testing
- Cover missing SQLite metadata and invalid session metadata classifications.
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Owen Lin
90c67e6f33