Reuse the existing PostgreSQL resources for Patroni bootstrap

What does this MR do?

Database objects, including roles, extensions, and functions, are factored out from postgresql::enable into postgresql::database_objects recipe database_objects custom resource (located in gitlab cookbook). This new recipe resource is used by both postgresql::enable and patroni::enable recipes. In order to do so, the resources are generalized and guarded to work with both standalone PostgreSQL and Patroni. As a result, Patroni's post-bootstrap script is made redundant and was eliminated.

Related issues

Closes #5419 (closed)

Checklist

See Definition of done.

• Changelog entry created. Not applicable for Documentation changes and minor changes.
• Documentation created/updated
• Tests added
• Integration tests added to GitLab QA, if applicable
• MR targeting master branch
• MR has a green pipeline on GitLab.com
• Equivalent MR/issue for CNG opened if applicable
• trigger-package has a green pipeline running against latest commit

Tests

• Single-node Patroni with no replicas
• Conversion of a standalone PostgreSQL to Patroni
• Multi-node Patroni with multiple replicas
• Conversion of a multi-node repmgr cluster to Patroni

Reviewer Checklist

In addition to above, reviewer must:

• Pipeline is green on dev.gitlab.org if the change is not touching documentation or internal cookbooks