Draft: Remove end-to-end API spec for push options MWPS

What does this MR do and why?

Given ...

• This test is flaky
• This functionality appears to be sufficiently tested in the lower levels
  • https://gitlab.com/gitlab-org/gitlab/-/blob/57e7d40bb8f96715a6bcc34dcf77e1482f61128b/spec/requests/api/merge_requests_spec.rb#L2951-2961
  • https://gitlab.com/gitlab-org/gitlab/-/blob/57e7d40bb8f96715a6bcc34dcf77e1482f61128b/spec/requests/api/merge_requests_spec.rb#L1401
  • https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/spec/controllers/projects/merge_requests_controller_spec.rb

This MR will delete this API spec from our end-to-end test base and rely on lower-level tests to determine if this functionality works.

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Before	After

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MR acceptance checklist

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