K8SPG-738: Add startup log to print commit hash, branch and build time

[egegunes]

CHANGE DESCRIPTION

$ k logs percona-postgresql-operator-86f7cf59cd-5hs7w
2025-03-26T14:54:22.654Z        INFO    Manager starting up     {"gitCommit": "72f3dc3c1b12063e3260fc1799e3e240ffb67ab1", "gitBranch": "K8SPG-738", "buildTime": "2025-03-26T14:52:43Z", "goVersion": "go1.23.7", "os": "linux", "arch": "amd64"}
...

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?