charts/redpanda: v25.1.2

Changed

• Client certificates are now named $FULLNAME-$CERT-client-cert.
• Bump Redpanda operator side car container tag to v25.1.3.
• Bump Redpanda default version to v25.1.12.

Fixed

• statefulset.podTemplate.spec.volumes can now be used to override chart generated volumes.
• Fix a bug with the way the config-watcher sidecar syncs users. The Kubernetes mechanism for writing out a changed secret is involves re-creating a symlink in the secrets directory that points to the mounted secret. Previously the config-watcher only detected changes to the entire directory and could potentially miss syncs, this resyncs everything anytime the symlink is recreated.
• mTLS client certificates are now generated per certificate, as required, instead of using a single and potentially invalid certificate.