K8SPG-549: merge upstream changes

[pooknull]

https://perconadev.atlassian.net/browse/K8SPG-549

DESCRIPTION

This PR also adds .spec.exposeReplicas field to the pg resource

CHECKLIST

Jira

• [ ] Is the Jira ticket created and referenced properly?
• [ ] Does the Jira ticket have the proper statuses for documentation (Needs Doc) and QA (Needs QA)?
• [ ] Does the Jira ticket link to the proper milestone (Fix Version field)?

Tests

• [ ] Is an E2E test/test case added for the new feature/change?
• [ ] Are unit tests added where appropriate?

Config/Logging/Testability

• [ ] Are all needed new/changed options added to default YAML files?
• [ ] Are the manifests (crd/bundle) regenerated if needed?
• [ ] Did we add proper logging messages for operator actions?
• [ ] Did we ensure compatibility with the previous version or cluster upgrade process?
• [ ] Does the change support oldest and newest supported PG version?
• [ ] Does the change support oldest and newest supported Kubernetes version?

[it-percona-cla]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
3 out of 12 committers have signed the CLA.

:white_check_mark: nmarukovich
:white_check_mark: hors
:white_check_mark: pooknull
:x: benjaminjb
:x: cbandy
:x: dsessler7
:x: ValClarkson
:x: tjmoore4
:x: tsykoduk
:x: tony-landreth
:x: jmckulk
:x: jsoref
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[JNKPercona]

Test name	Status
custom-extensions	passed
demand-backup	passed
init-deploy	passed
monitoring	passed
operator-self-healing	passed
scaling	passed
scheduled-backup	passed
self-healing	passed
start-from-backup	passed
telemetry-transfer	passed
upgrade-minor	passed
users	passed
We run 12 out of 12

commit: https://github.com/percona/percona-postgresql-operator/pull/720/commits/e57941cc252602d58b5a11ada2480b1242e2b2f8 image: perconalab/percona-postgresql-operator:PR-720-e57941cc2