Update MariaDB operator to a new version.
```release-note
[ci,dx] Update MariaDB operator version
```
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## What this PR does
### Release note
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```release-note
[]
```
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## Summary by CodeRabbit
* **New Features**
* Support for external MariaDB instances and physical backups management
* Validation webhook added for physical backups
* New config option to specify MariaDB image registry/name
* **Updates**
* MariaDB operator bumped to 25.10.2
* Default MariaDB version updated from 11.4 to 11.8
* Expanded Kubernetes permissions for endpoint slices and volume
snapshots
* Pod metadata label added to MariaDB pods
* **Documentation**
* Updated docs links and version badges in charts README
<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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