Reduce the discrepancies in Protected Branches feature

There are a lot of discrepancies in the Protected Branches feature:

• JS: https://gitlab.com/rymai-gitlab/ce_ee_diffs_generator/blob/7eb249a009873896176df383d42f94eb8ab9ac7d/diffs/app-assets.diff#L1370-2170
• Controllers: https://gitlab.com/rymai-gitlab/ce_ee_diffs_generator/blob/7eb249a009873896176df383d42f94eb8ab9ac7d/diffs/app-controllers.diff#L1761-1811

mentioned in commit 396941fa

mentioned in commit a96f3e18

mentioned in commit 1d4266f9