Fix wait! for scripts/trigger-build

Lin Jen-Shinrequested to merge
fix-wait-for-trigger-build into master

What does this MR do?

Fix wait! for scripts/trigger-build. If we just break it'll only break from the loop, and immediately raise an exception. We need to return to avoid reaching the raise clause.

Closes #239336 (closed)

Edited by Lin Jen-Shin

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