Rename py package validation script

[Balandat]

We now build the packages outside of this script, so updating the name to reflect this and avoid confusion.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.98%. Comparing base (8536468) to head (04f4a3b). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2543 +/- ## ======================================= Coverage 99.98% 99.98% ======================================= Files 193 193 Lines 17010 17010 ======================================= Hits 17007 17007 Misses 3 3 ```

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@Balandat has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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@Balandat merged this pull request in pytorch/botorch@ab5ffea426e492c97fdb4aa3868aa45cb14722da.