Fix commits ref switcher

What does this MR do and why?

Fixes the ref switcher on the commits page when selecting a branch/ref containing special characters.

Screenshots or screen recordings

before	after

How to set up and validate locally

1. Create a branch containing a special character (branch-#-hash)
2. Navigate to Project > Commits
3. Select the branch created in Step 1
4. The page should load/work as expected

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.