K8SPG-956: Reduce CPU waste by filtering by RMGR in pg_waldump

[jeltz]

We can reduce the amount of work done by pg_waldump and grep in the archive_command by first letting pg_waldump filter by the relevant resource manager.

Do you want me to create a ticket in Jira for this?

[it-percona-cla]

All committers have signed the CLA.

[egegunes]

Thank @jeltz, I already created the jira ticket.

[JNKPercona]

Test Name	Result	Time
backup-enable-disable	passed	00:11:06
builtin-extensions	passed	00:05:03
cert-manager-tls	passed	00:05:02
custom-envs	passed	00:19:04
custom-extensions	passed	00:13:24
custom-tls	passed	00:06:36
database-init-sql	passed	00:02:09
demand-backup	passed	00:26:27
demand-backup-offline-snapshot	passed	00:13:56
dynamic-configuration	passed	00:03:17
finalizers	passed	00:04:13
init-deploy	passed	00:02:35
huge-pages	passed	00:03:11
monitoring	passed	00:07:19
monitoring-pmm3	passed	00:08:08
one-pod	passed	00:06:08
operator-self-healing	passed	00:11:34
pg-tde	passed	00:09:29
pitr	passed	00:12:37
scaling	passed	00:05:42
scheduled-backup	passed	00:30:37
self-healing	passed	00:08:42
sidecars	passed	00:03:04
standby-pgbackrest	passed	00:12:14
standby-streaming	passed	00:09:07
start-from-backup	passed	00:12:53
tablespaces	passed	00:07:34
telemetry-transfer	passed	00:04:35
upgrade-consistency	passed	00:06:01
upgrade-minor	passed	00:05:44
users	passed	00:04:36

Summary	Value
Tests Run	31/31
Job Duration	01:35:25
Total Test Time	04:42:23

commit: c474dfe
image: perconalab/percona-postgresql-operator:PR-1463-c474dfee7