K8SPG-511 add default values

[nmarukovich]

CHANGE DESCRIPTION

Problem:
we have default value for spec.backups.pgbackrest.restore.enabled . So restore part would be added in our yaml in openshift even if we don't have it in alm-example. But in restore part we have required field: spec.backups.pgbackrest.restore.repoName . And now we should add it too.

Cause:
Short explanation of the root cause of the issue if applicable.
Openshift transforms alm-example in yaml where fields with default values added
Solution:
add default values for required fields.

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?

[inelpandzic]

Do we need to have task number in the desc? When you add a comment on a field kubebuilder treats as a field description. Did you intended to have it on CRD desc?

[JNKPercona]

Test name	Status
custom-extensions	passed
custom-tls	passed
demand-backup	passed
finalizers	passed
init-deploy	passed
major-upgrade	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 19 out of 19

commit: 6d9ebba
image: perconalab/percona-postgresql-operator:PR-952-6d9ebbab5