Charlie Marsh 483559cc75 Coalesce concurrent remote metadata requests (#36184) ...

## Why

Concurrent callers can request metadata for the same remote path, resulting in duplicate `fs/getMetadata` RPCs.

## What changed

- Share an unsandboxed metadata request with concurrent callers for the same path while the RPC is in flight.
- Remove completed and failed requests so later callers fetch fresh metadata, and clear in-flight entries after filesystem mutations, including failed mutations.
- Keep requests for different paths separate and bypass sharing for sandboxed requests.

## Testing

Add WebSocket-backed tests covering shared results and errors, retry after cancellation or failure, mutation invalidation, and path and sandbox isolation.

GitOrigin-RevId: f91e51b94db3fb984597aec8d302b8715778121c

2026-07-30 16:35:20 +00:00

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