1. It makes sense to reuse these constants since we had them duplicated
in the previous enum implementation. This also simplifies our
`check_access` implementation, because we can use
`project.team.max_member_access` directly.
2. Use `accepts_nested_attributes_for` to create push/merge access
levels. This was a bit fiddly to set up, but this simplifies our code
by quite a large amount. We can even get rid of
`ProtectedBranches::BaseService`.
3. Move API handling back into the API (previously in
`ProtectedBranches::BaseService#translate_api_params`.
4. The protected branch services now return a `ProtectedBranch` rather
than `true/false`.
5. Run `load_protected_branches` on-demand in the `create` action, to
prevent it being called unneccessarily.
6. "Masters" is pre-selected as the default option for "Allowed to Push"
and "Allowed to Merge".
7. These changes were based on a review from @rymai in !5081.
1. The new data model moves from `developers_can_{push,merge}` to
`allowed_to_{push,merge}`.
2. The API interface has not been changed. It still accepts
`developers_can_push` and `developers_can_merge` as options. These
attributes are inferred from the new data model.
3. Modify the protected branch create/update services to translate from
the API interface to our current data model.
not_found appends string "Not Found" to the argument causing the resulting message to be "Branch does not exist Not Found" which is an incorrect error message.
Changed the argument of not_found! for 'unprotect' command to "Branch" from "Branch does not exist". This makes the final error message to appear as "Branch Not Found" which is correct and same as error messages for other commands like 'protect'.
Branch names that contain `/` return a 405 error when being deleted because the slash is escaped to `%2F`
This patch will unescape the param prior to executing the delete action.
