CLN: Possibly obsolete scripts
xref #31038

I'm unsure if the following scripts are still used:
```
scripts/find_commits_touching_func.py
ci/check_cache.sh
ci/check_git_tags.sh
ci/travis_process_gbq_encryption.sh
```

The next I assume are for the release, but may be there is something obsolete here:
```
scripts/build_dist_for_release.sh
scripts/build_dist.sh
scripts/download_wheels.py
```