Summary:
I have found that the newly added unit tests PgCatalogVersionConnManagerTest.*
fails on mac with an error like the following:

```
[ts-1] F20250807 19:46:07 ../../src/yb/yql/pgwrapper/pg_wrapper.cc:1460] Check failed: _s.ok() Bad status: Internal error (yb/yql/pgwrapper/pg_wrapper.cc:937): Unable to create shared memory segment for sharing the stats for Ysql Connection Manager.
```

This is because conn mgr is supported only on linux.

I made a change to disable the test on mac.

The test is already disable in tsan and asan because there are many tsan or asan
errors in the odyssey (an advanced multi-threaded connection pooler) code.
Jira: DB-17786

Test Plan: jenkins

Reviewers: sanketh

Reviewed By: sanketh

Subscribers: yql

Differential Revision: https://phorge.dev.yugabyte.com/D45936