K8SPG-778: Add unit tests for disable restore finalizer

[egegunes]

CHANGE DESCRIPTION

Problem:
Short explanation of the problem.

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	failure	00:00:00
custom-extensions	failure	00:00:00
custom-tls	failure	00:00:00
database-init-sql	failure	00:00:00
demand-backup	skipped	00:00:00
finalizers	skipped	00:00:00
init-deploy	skipped	00:00:00
monitoring	skipped	00:00:00
monitoring-pmm3	skipped	00:00:00
one-pod	skipped	00:00:00
operator-self-healing	skipped	00:00:00
pgvector-extension	skipped	00:00:00
pitr	skipped	00:00:00
scaling	skipped	00:00:00
scheduled-backup	skipped	00:00:00
self-healing	skipped	00:00:00
sidecars	skipped	00:00:00
start-from-backup	skipped	00:00:00
tablespaces	skipped	00:00:00
telemetry-transfer	skipped	00:00:00
upgrade-consistency	skipped	00:00:00
upgrade-minor	skipped	00:00:00
users	skipped	00:00:00
We run 4 out of 23		N/A

commit: e0148ea
image: perconalab/percona-postgresql-operator:PR-1154-e0148eaaa