Fix commit ref for integration tests workflow

[chuckwondo]

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📚 Documentation preview 📚: https://earthaccess--870.org.readthedocs.build/en/870/

[github-actions]

👈 Launch a binder notebook on this branch for commit a501b5b

I will automatically update this comment whenever this PR is modified

👈 Launch a binder notebook on this branch for commit d1ac252

👈 Launch a binder notebook on this branch for commit 34e1624

[chuckwondo]

Ok, integration tests now pass for pull_request, but fail for pull_request_target, but that's okay, because pull_request_target is not using the correct commit. Once this lands, I think this should do the trick, including preventing both pull_request and pull_request_target events attempting to run int. tests.

Only pull_request will run int. tests when PR is from another branch in this repo, and pull_request_target will run int. tests when PR is from a fork.

[jhkennedy]

Looks good! One minor take-it-or-leave-it comment on the if conditional is all.

[chuckwondo]

Thanks guys. I pulled in your suggestion @jhkennedy, so one of you will need to approve again.