Upgrade to Operator SDK 1.41.1

[stuggi]

This commit upgrades the mariadb-operator to use Operator SDK version 1.41.1, with the following major changes:

Project Structure:

• Move pkg/ packages to internal/ following Go best practices
• Move controllers/ to internal/controller/ per new operator-sdk layout
• Replace main.go with cmd/main.go
• Add controller and webhook test suites

Configuration Updates:

• Split certificate management into separate metrics and webhook certs
• Add network policies for metrics and webhook traffic
• Rename auth_proxy resources to metrics for clarity
• Add admin RBAC roles for all CRD types
• Update manager deployment configuration and patches
• Modernize kustomization configurations

Webhook Changes:

• Add dedicated webhook implementation in internal/webhook/v1beta1/
• Remove old CRD webhook and CA injection patches
• Update webhook manifests and service configuration

Cleanup:

• Remove obsolete config patches and overlays

Dependencies:

• Update go.mod and go.sum for operator-sdk 1.41.1 dependencies

Jira: OSPRH-22041

Assisted-by: claude-4-sonnet

[openshift-ci]

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[stuggi]

/retest

[stuggi]

/retest

[openshift-ci]

@stuggi: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/mariadb-operator-build-deploy-kuttl	5631d72	link	true	/test mariadb-operator-build-deploy-kuttl
ci/prow/mariadb-operator-build-deploy-chainsaw	5631d72	link	true	/test mariadb-operator-build-deploy-chainsaw

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