CLOUD-727 Bump golang 1251

[gkech]

CHANGE DESCRIPTION

Problem:

Bump operator's go version to https://tip.golang.org/doc/go1.25

Cause:
Short explanation of the root cause of the issue if applicable.

Solution:

Verification:

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?

[JNKPercona]

Test Name	Result	Time
backup-enable-disable	passed	00:07:02
custom-extensions	passed	00:14:48
custom-tls	passed	00:05:53
database-init-sql	passed	00:03:31
demand-backup	passed	00:24:10
finalizers	passed	00:05:44
init-deploy	passed	00:02:54
monitoring	passed	00:07:18
monitoring-pmm3	failure	00:06:37
one-pod	passed	00:05:44
operator-self-healing	passed	00:08:17
pgvector-extension	passed	00:02:39
pitr	passed	00:12:24
scaling	passed	00:05:05
scheduled-backup	passed	00:35:58
self-healing	passed	00:08:59
sidecars	passed	00:02:36
start-from-backup	passed	00:11:51
tablespaces	passed	00:06:58
telemetry-transfer	passed	00:03:49
upgrade-consistency	failure	00:05:53
upgrade-minor	passed	00:05:53
users	passed	00:04:41
We run 23 out of 23		03:18:52

commit: fa2a1ba
image: perconalab/percona-postgresql-operator:PR-1286-fa2a1ba7e