Skip archiving useless build artifacts (#63785)

Skip archiving useless build artifacts (#63785)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63785

We currently zip up everything in `build/` which includes a lot of cruft (`.o` files, random things copied in from dependencies, etc). This makes the artifact bigger (slower upload/download times, and takes about 1.5 minutes to archive). This change makes archiving instead take ~15 seconds and removes the 50 second upload to GitHub step that isn't as useful now that we have the HUD PR page that lists out all artifacts.

Test Plan: Imported from OSS

Reviewed By: seemethere, janeyx99

Differential Revision: D30494444

Pulled By: driazati

fbshipit-source-id: 93202dba7387daeb4859a938110b02ff2dc2ccc4