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Fix get preview channel changes script (#2501)

Fixes the text we match on to get PR commits and also prints the release
notes of each PR

Release Notes:

* Skip
J
Joseph T. Lyons committed
f2a74017df3e294a50e7e7a0cf28e3ff25880842
Committed by GitHub <noreply@github.com> on 5/22/2023, 3:47:07 AM