CI: Restrict CI jobs to only relevant ones

CI takes a long time (hours) to run and often requires reruns due to flaky tests in "Required" jobs.

https://github.com/prestodb/presto/pull/28440 PR changes the Verifier, but runs full CI, including 2 hour+ Prestissimo jobs (with and w/o GPUs).

It would be nice to add some basic logic to run only relevant jobs. E.g. for Verifier-only changes, nothing outside of Verifier needs to run.

CC: @amitkdutta @majetideepak @aditi-pandit @kgpai