Re-compile merge request Vue app after jQuery ajax

Merged Phil Hughes requested to merge mr-stuck-checking-fix into master

Previously the code was setup to not send a request to the backend if approvals is setup, this changes that by always sending this request (like it should). & then after getting & replacing the HTML the Vue app re-compiles itself.

This fixes a bug that was stopping certain merge requests from changing content away from 'Checking ability to merge automatically' check issue-reproduce/persistent-mr-spinners!1 to see the bug in action.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/27134