K8SPG-757: restricted security context for patroni version check container

[pooknull]

https://perconadev.atlassian.net/browse/K8SPG-757

DESCRIPTION

This PR sets safe defaults for security context of the patroni-version-check container aligning it with the settings of other containers. This ensures compatibility in environments where readOnlyRootFilesystem: true is enforced.

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	00:00:00
custom-extensions	passed	00:00:00
custom-tls	passed	00:00:00
database-init-sql	passed	00:00:00
demand-backup	passed	00:00:00
finalizers	passed	00:00:00
init-deploy	passed	00:00:00
monitoring	passed	00:00:00
monitoring-pmm3	passed	00:00:00
one-pod	passed	00:00:00
operator-self-healing	passed	00:00:00
pgvector-extension	passed	00:00:00
pitr	passed	00:00:00
scaling	passed	00:00:00
scheduled-backup	passed	00:00:00
self-healing	passed	00:00:00
sidecars	passed	00:00:00
start-from-backup	passed	00:00:00
tablespaces	passed	00:00:00
telemetry-transfer	passed	00:00:00
upgrade-consistency	passed	00:00:00
upgrade-minor	passed	00:00:00
users	passed	00:04:31
We run 23 out of 23		00:04:31

commit: a831ee9
image: perconalab/percona-postgresql-operator:PR-1202-a831ee9fe