fix(ci): checkout changelog script from master (#23382)

* fix(ci): checkout changelog script from master

* Add debug statement

* Add pull_request to test modified workflow

* Revert "Add pull_request to test modified workflow" + "Add debug statement"

* Change ref to master

* Re-add debug

* Remove debug

This reverts commit 02a67c4d5c7e1d60629c16fc8c343e8572713d60.

* Remove whitespace