Fix slot metric query to account for replica slots

[keithf4]

Description

Update slot monitoring query to account for logical slots on replicas (patroni feature)

Update changelog and documentation for next release.

Update PR Template & CODEOWNERS

Get pgbouncer fix merged back into development branch. It had gotten merged into main

Fixes #290

Depends on #

Type of change

Please check all options that are relevant

• [x] Bug fix (change which fixes an issue)
• [ ] Feature (change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update only

How Has This Been Tested?

Tested Configuration:

• [x] Ansible, Specify version(s): 2.9
• Installation method:
  • [ ] Binary install from source, version:
  • [ ] OS package repository, distro, and version:
  • [ ] Local package server, version:
  • [ ] Custom-built package, version:
  • [ ] Other:
• [x] PostgreSQL, Specify version(s): 12
• [x] docs tested with hugo version(s): 0.80.0

Tested with playbook(s):

Checklist:

• [ ] My changes generate no new lint warnings
• I have made corresponding changes to:
  • [ ] the documentation
  • [ ] the release notes
  • [ ] the upgrade doc