Rasmus Rygaard eb49f491c6
Add explicit remote executor connection refresh ( #40710 ) ...
## Why
Planned executor replacement needs a fresh session without waiting for the old
session's transient-disconnect recovery to finish.
## What changed
- Add `Environment::refresh_connection` for remote Noise registry-backed
environments. It performs a fresh registry lookup, reuses a healthy session
when the executor identity is unchanged, and connects to a replacement when
it has changed.
- Retire superseded sessions and connection attempts so they cannot publish
stale state, accept late RPC results, or replay outstanding work.
- Preserve the existing environment and filesystem handles while replacing the
underlying client, and require a live status probe before refresh succeeds.
## Testing
Add coverage for replacement and session reuse, recovery and connection races,
lookup and handshake failures, handle preservation, and late RPC responses.
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Rasmus Rygaard
eb49f491c6