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 this is useful for keeping the PVC around after removing the deployment.

I also added a warning into the NOTES after a deployment to detect this specific use case. Informing the user that this isn't supported by GitLab as setting this annotation can imply they are going for a more "production ready" deployment of MinIO.

Related issues

Closes #3001

Author checklist

See Definition of done.

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Required

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Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Tests added/updated
• Integration tests added to GitLab QA I think this does not apply, normal tests are provided.
• Equivalent MR/issue for omnibus-gitlab opened Helm Chart only feature, not affecting omnibus
• Equivalent MR/issue for Gitlab Operator project opened (see Operator documentation on impact of Charts changes) Helm Chart only feature, default values are still valid, no change to operator necessary
• Validate potential values for new configuration settings. Formats such as integer 10, duration 10s, URI scheme://user:passwd@host:port may require quotation or other special handling when rendered in a template and written to a configuration file.