[Backport to 14] [CI] Do not run check-in-tree after pushes to llvm_release_* #2803
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The check-in-tree tests take about 50 minutes to run compared to <5 minutes for check-out-of-tree. This causes considerable congestion on the runners when backports get merged to several llvm_release_* branches around the same time.
Since the value of these post-push checks is relatively low, disable them; they will still run on pull requests.
(cherry picked from commit 196bbc9)