Summary:
Applied every lint warning / error to `pg_yb_utils.c`, except for `likely_bad_capitalization_in_errmsg`, because that would be a user-facing change.
Jira: DB-14652

Test Plan: Jenkins: compile only

Reviewers: patnaik.balivada

Reviewed By: patnaik.balivada

Subscribers: patnaik.balivada, yql

Differential Revision: https://phorge.dev.yugabyte.com/D40868