Adds support for custom annotations to minio PVC

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What does this MR do?

This MR adds support for passing custom annotations to the MinIO PVC. As mentioned in #3001 (closed) this is useful for keeping the PVC around after removing the deployment.

Related issues

Closes #3001 (closed)

Author checklist

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Required

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• Merge Request Title and Description are up to date, accurate, and descriptive.
• MR targeting the appropriate branch.
• MR has a green pipeline.
• Documentation created/updated.
• Tests added/updated, and test plan for scenarios not covered by automated tests.
• Equivalent MR/issue for omnibus-gitlab opened. Helm Chart only feature, not affecting omnibus

Reviewers checklist

• MR has a green pipeline on https://gitlab.com/gitlab-org/charts/gitlab.
• Consider downstream impact to the Operator, as per evaluating impact from changes to GitLab Chart.

Closes #3001 (closed)