[tools] Correctly infer base rev in pull requests #19650
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The "before" property is only present in the "Push" GitHub Event. When
building for a pull request, derive the base revision from the "base"
property of the pull request object [2].
[1] https://developer.github.com/v3/activity/events/types/#pushevent
[2] https://developer.github.com/v3/pulls/