K8SPG-613: replace initImage with initContainer

[pooknull]

https://perconadev.atlassian.net/browse/K8SPG-613

DESCRIPTION

This PR replaces .spec.initImage and .spec.backups.pgbackrest.initImage with .spec.initContainer and .spec.backups.pgbackrest.initContainer.
These fields have the following spec:

initContainer:
  image: perconalab/percona-postgresql-operator:main
  resources:
    limits:
      cpu: 2.0
      memory: 4Gi
  containerSecurityContext:
    fsGroup: 1001
    runAsUser: 1001
    runAsNonRoot: true
    fsGroupChangePolicy: "OnRootMismatch"
    runAsGroup: 1001
    seLinuxOptions:
      type: spc_t
      level: s0:c123,c456
    seccompProfile:
      type: Localhost
      localhostProfile: localhost/profile.json
    supplementalGroups:
    - 1001
    sysctls:
    - name: net.ipv4.tcp_keepalive_time
      value: "600"
    - name: net.ipv4.tcp_keepalive_intvl
      value: "60"

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?

[gkech]

we have some assertion issues on the upgrade-consistency test

[gkech]

we need to also check the unit tests, TestGenerateBackupJobIntent

[nmarukovich]

@hors should we use updated image name?

[hors]

@nmarukovich only from PGO 2.7.0

[JNKPercona]

Test name	Status
custom-extensions	passed
custom-tls	passed
demand-backup	passed
finalizers	passed
init-deploy	passed
monitoring	passed
monitoring-pmm3	passed
one-pod	passed
operator-self-healing	passed
pitr	passed
scaling	passed
scheduled-backup	passed
self-healing	passed
sidecars	passed
start-from-backup	passed
tablespaces	passed
telemetry-transfer	passed
upgrade-consistency	passed
upgrade-minor	passed
users	passed
We run 20 out of 20

commit: f62c485
image: perconalab/percona-postgresql-operator:PR-1117-f62c48539

[hors]

@pooknull LGTM but please create helm chart PR