Rasmus Rygaard 42bb50d502
Allow metadata updates without materializing threads ( #38413 ) ...
## Why
Thread stores may filter a metadata patch to a no-op. Requiring every successful
update to return a `StoredThread` forces those implementations to materialize a
thread even when the caller does not need one.
## What changed
- Let `ThreadStore::update_thread_metadata` return `None` after a successful
update that did not materialize a thread.
- Preserve the materialized-thread contract of `LiveThread` and `ThreadManager`
metadata updates by reading the thread when the store returns `None`.
- Keep completion-only metadata updates from issuing that fallback read.
## Testing
Cover materialized in-memory updates and verify that fallback reads occur only
for callers that require the updated thread.
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42bb50d502