K8SPG-820 - Introduce a collation mismatch check

[valmiranogueira]

CHANGE DESCRIPTION

Problem:

Introduce a collation mismatch check to identify issues during upgrades to newer versions.
Since this check serves primarily for documentation purposes, add the SKIP_TEST_WARNINGS variable to allow skipping this verification when needed.

Cause:
Short explanation of the root cause of the issue if applicable.

Solution:
Short explanation of the solution we are providing with this PR.

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 all needed new/changed options added to the Helm Chart?
• 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?

[JNKPercona]

Test Name	Result	Time
backup-enable-disable	passed	00:07:12
custom-extensions	passed	00:11:30
custom-tls	passed	00:05:41
database-init-sql	passed	00:03:15
demand-backup	passed	00:25:51
finalizers	passed	00:03:45
init-deploy	passed	00:03:14
monitoring	passed	00:07:30
monitoring-pmm3	passed	00:07:35
one-pod	passed	00:05:50
operator-self-healing	passed	00:08:37
pgvector-extension	passed	00:02:30
pitr	passed	00:11:15
scaling	passed	00:04:37
scheduled-backup	passed	00:24:39
self-healing	passed	00:08:25
sidecars	passed	00:02:28
start-from-backup	passed	00:10:28
tablespaces	passed	00:07:41
telemetry-transfer	passed	00:03:31
upgrade-consistency	passed	00:05:08
upgrade-minor	passed	00:05:26
users	passed	00:04:14
We run 23 out of 23		03:00:32

commit: f06435b
image: perconalab/percona-postgresql-operator:PR-1234-f06435bb7