Merge #123652

123652: roachtest: skip opr_sanity.sql in pg_regress r=yuzefovich a=yuzefovich

We currently have incomplete `pg_catalog.pg_proc` contents, so `opr_sanity.sql` subtest results in invalid entries that need to be updated every time when a new builtin function is introduced, which is an unnecessary toil. Let's skip this subtest for now.

Informs: #123401.
Informs: #123651.
Epic: None

Release note: None

Co-authored-by: Yahor Yuzefovich <yahor@cockroachlabs.com>