K8SPG-502: cleanup outdated backups

[pooknull]

https://perconadev.atlassian.net/browse/K8SPG-502

DESCRIPTION

Problem: pg-backup and backup jobs are not being cleaned up after the backup was deleted by pgbackrest, i.e., due to `repo-retention-` options.*

Solution: The operator should check for available backups using the pgbackrest info command and delete expired backups.

It is not possible to distinguish which pg-backup corresponds to the record in pgbackrest info if it was created with the old version of the operator. To solve this problem, it was decided not to clean up backups created with the old operator version. To be able to distinguish between pg backups from the old operator version and those from the new version, the field .status.crVersion has been added.

CHECKLIST

Jira

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

Tests

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

Config/Logging/Testability

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

[JNKPercona]

Test name	Status
custom-extensions	passed
demand-backup	passed
init-deploy	passed
monitoring	passed
one-pod	passed
operator-self-healing	passed
pitr	passed
scaling	passed
scheduled-backup	passed
self-healing	passed
start-from-backup	passed
tablespaces	passed
telemetry-transfer	passed
upgrade-consistency	passed
upgrade-minor	passed
users	passed
We run 16 out of 16

commit: https://github.com/percona/percona-postgresql-operator/pull/763/commits/cf04e48ce3e330bfc166a7e68a5f31eae0c8132c image: perconalab/percona-postgresql-operator:PR-763-cf04e48ce