Remove jQuery class from the repository branch settings (#30184)
- Switched from jQuery class functions to plain JavaScript `classList`
- Tested the repository branch settings functionality and it works as
before
Signed-off-by: Yarden Shoham <git@yardenshoham.com>
(cherry picked from commit 2b3f7d3e966ab60cb147115303d1992e8b50d4df)
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