K8SPXC-1214: add .spec.backup.ttlSecondsAfterFinished field

[pooknull]

https://perconadev.atlassian.net/browse/K8SPXC-1214

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?
• Are OpenShift compare files changed for E2E tests (compare/*-oc.yml)?

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 PXC version?
• Does the change support oldest and newest supported Kubernetes version?

[JNKPercona]

Test Name	Result	Time
affinity-8-0	passed	00:00:00
auto-tuning-8-0	passed	00:00:00
backup-storage-tls-8-0	failure	00:21:45
cross-site-8-0	failure	00:20:38
custom-users-8-0	passed	00:00:00
demand-backup-cloud-8-0	failure	00:35:33
demand-backup-encrypted-with-tls-8-0	failure	00:35:47
demand-backup-8-0	failure	00:19:38
demand-backup-flow-control-8-0	failure	00:18:45
demand-backup-parallel-8-0	passed	00:00:00
demand-backup-without-passwords-8-0	failure	00:17:10
haproxy-5-7	passed	00:00:00
haproxy-8-0	passed	00:00:00
init-deploy-5-7	passed	00:00:00
init-deploy-8-0	passed	00:00:00
limits-8-0	passed	00:00:00
monitoring-2-0-8-0	passed	00:00:00
monitoring-pmm3-8-0	passed	00:00:00
one-pod-5-7	failure	00:32:26
one-pod-8-0	failure	00:32:20
pitr-8-0	failure	00:44:31
pitr-gap-errors-8-0	failure	00:38:38
proxy-protocol-8-0	passed	00:00:00
proxysql-sidecar-res-limits-8-0	passed	00:00:00
pvc-resize-5-7	passed	00:00:00
pvc-resize-8-0	passed	00:00:00
recreate-8-0	passed	00:00:00
restore-to-encrypted-cluster-8-0	failure	00:31:53
scaling-proxysql-8-0	passed	00:00:00
scaling-8-0	passed	00:00:00
scheduled-backup-5-7	failure	00:23:08
scheduled-backup-8-0	failure	00:22:23
security-context-8-0	failure	00:37:56
smart-update1-8-0	passed	00:00:00
smart-update2-8-0	passed	00:00:00
storage-8-0	passed	00:00:00
tls-issue-cert-manager-ref-8-0	passed	00:00:00
tls-issue-cert-manager-8-0	passed	00:00:00
tls-issue-self-8-0	passed	00:00:00
upgrade-consistency-8-0	passed	00:00:00
upgrade-haproxy-5-7	passed	00:00:00
upgrade-haproxy-8-0	passed	00:00:00
upgrade-proxysql-5-7	passed	00:00:00
upgrade-proxysql-8-0	passed	00:00:00
users-5-7	passed	00:00:00
users-8-0	passed	00:00:00
validation-hook-8-0	passed	00:00:00

Summary	Value
Tests Run	47/47
Job Duration	02:36:36
Total Test Time	07:12:36

commit: 269f369
image: perconalab/percona-xtradb-cluster-operator:PR-2234-269f3694