feat: generate postgres user secret with r2dbc uris

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Checklist:

• [x] Have you added an explanation of what your changes do and why you'd like them to be included?
• [x] Have you updated or added documentation for the change, as applicable?
• [x] Have you tested your changes on all related environments with successful results, as applicable?
  • [x] Have you added automated tests?

Type of Changes:

• [ ] New feature
• [ ] Bug fix
• [ ] Documentation
• [ ] Testing enhancement
• [x] Other

What is the current behavior (link to any open issues here)?

The operator generates user secrets. For example if you use a r2dbc based application you cannot reference the jdbc-uri key from the secret.

What is the new behavior (if this is a feature change)?

• [ ] Breaking change (fix or feature that would cause existing functionality to change)

r2dbc-uri keys are added to the secrets starting with r2dbc:postgresql://....

Other Information: