[CI]Mac OS Pipeline not kicked off

[ArturNiederfahrenhorst]

What happened + What you expected to happen

Why are these changes needed?

I bisected our buildkite history from master (where this kickoff always happens) and found the following:

First time the pipeline did not get kicked off properly:

Last time the pipeline got kicked off properly:

The pipeline has been broken since Feb 14th, very close to #32409.
I don't have enough context on the changes in the PR in question to confirm that it causes this issue so this is sort of a shot in the dark.

Versions / Dependencies

master

Reproduction script

Open PR to master, have a look at buildkite to see that Mac OS tests don't run.

Issue Severity

None

[stephanie-wang]

Hmm it seems like it stopped working before that PR, though?

Should we try reverting it and see if it passes in CI?

[ArturNiederfahrenhorst]

@rkooo567 said that this was fixed by 7774cc3, I don't see the jobs running on CI for master right now though.

The buildkite job for the PR in question still ran fine: https://buildkite.com/ray-project/oss-ci-build-pr/builds/12043#_

[ArturNiederfahrenhorst]

The first PR where they did not run is d092b12

[scv119]

Looks the problem is fixed by @krfricke