Upgrade MariaDB Operator Helm Chart to 0.38.1 and Galera Kustomize Patch

[vish6760]

Summary

This PR upgrades the MariaDB Operator Helm chart from v0.36.0 → v0.38.1 and updates the corresponding base overrides. The upgrade also fixes MariaDB cluster backup failures in airgap environments caused by hardcoded images in the config map, which are now easily overridden in v0.38.1.
It also updates the Kustomize Galera patch to use just one PVC for keeping both the data and the config files.

Key Changes (Helm Chart)

Section / Key	Old (v0.36.0)	New (v0.38.1)	Notes / Impact
metrics.metricRelabelings	Not present	metricRelabelings: []	Prometheus relabeling support
metrics.relabelings	Not present	relabelings: []	Scraping label rewrites
pprof	Not present	enabled: false, port: 6060	Profiling HTTP endpoint
topologySpreadConstraints	Not present	[]	HA pod placement
priorityClassName	Not present	""	Pod priority support
webhook.pdb	Not present	enabled: false, maxUnavailable: 1	PDB for webhook controller
certController.pdb	Not present	Same as above	PDB for cert-controller
certController.caValidity	35064h	caLifetime: 35064h	Renamed
certController.certValidity	8766h	certLifetime: 8766h	Renamed
certController.lookaheadValidity	2160h	renewBeforePercentage: 33	Defines renewal timing
config	Not present	Default operator images & versions	Must override for internal registry

---

Kustomize Galera Patch Updates

config.reuseStorageVolume: true

Reference

MariaDB Operator Galera Storage
MariaDB Operator Config Map In 0.36.0
MariaDB Operator Config Map In 0.38.1

Linked Issue

Fixes #1239