client/v3: closeRequireLeader leaves an orphaned keepAlives entry that keeps sending keepalive requests forever

Bump `go.opentelemetry.io/otel` to 1.41.0

Performance investigation for robustness test

[Robustness tests] Race in robustness code

Plan to release v3.5.31

`clientv3.dial` blocks when a non-zero DialTimeout is set

[release-3.5] workflow pull-etcd-govulncheck fails

`TestIsDirWriteable` in `client/pkg/fileutil` fails as root on non-Debian distributions

[Bug] v3.7.0-beta.0: Control-Plane Deadlock and Cluster Consensus Availability Loss During Single-Node Downgrade

ETCD learner members cannot be defragmented, causing persistent storage bloat.