Rename service to better reflect what it does
What does this MR do and why?
The ProtectedBranchesForcePushService
service was initially used only for restricting force pushing, but it was later extended to regular pushes as well.
This change renames to service to make it more clear.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #420629 (closed)