Summary:
`ysqlsh -V` gives the following result:
```
psql (PostgreSQL) 15.2-YB-2.25.1.0-b0
```

The outputted command name is different than the actual command name.

There are three options to fix this check:
1. Update `ysqlsh -V` to print `ysqlsh (PostgreSQL) 15.2...`. This would have a pretty large impact.
2. Disable the check.
3. Modify the check to reflect the differences in Yugabyte.

Option 3 seems the best to preserve the safety of the check, without having a far-reaching impact, so this change uses that approach.
Jira: DB-14660

Test Plan: Jenkins

Reviewers: hsunder, fizaa

Reviewed By: hsunder

Subscribers: yql

Differential Revision: https://phorge.dev.yugabyte.com/D40888