fix: recover interrupted GETs and heal operations (#7876)

* fix(heal): retry interrupted internode shard writes

* fix(deps): update rustls for RUSTSEC-2026-0285

* fix(heal): retain RPC transport failures across metadata probes

* test(heal): wait for replacement disk and coordinator readiness

* test(connect): validate service-only diagnostic capabilities

* fix(s3): resume GET bodies after erasure read quorum loss