K8SPG-833_fix_test add stability

[nmarukovich]

CHANGE DESCRIPTION

Problem:
In some cases we check variable before it is available in container. To fix it, let's check that all replicas is ready.

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	00:10:25
custom-envs	passed	00:18:37
custom-extensions	passed	00:15:11
custom-tls	passed	00:05:52
database-init-sql	passed	00:02:15
demand-backup	passed	00:26:08
finalizers	passed	00:03:54
init-deploy	passed	00:03:00
monitoring	passed	00:08:50
monitoring-pmm3	passed	00:08:29
one-pod	passed	00:05:34
operator-self-healing	passed	00:08:22
pgvector-extension	passed	00:02:48
pitr	passed	00:11:55
scaling	passed	00:05:01
scheduled-backup	passed	00:25:56
self-healing	passed	00:09:25
sidecars	passed	00:02:24
start-from-backup	passed	00:14:27
tablespaces	passed	00:06:52
telemetry-transfer	passed	00:03:27
upgrade-consistency	passed	00:08:05
upgrade-minor	passed	00:05:10
users	passed	00:04:27

Summary	Value
Tests Run	24/24
Job Duration	01:21:14
Total Test Time	03:36:46

commit: 09cd29b
image: perconalab/percona-postgresql-operator:PR-1344-09cd29bc6