Render call to action on MR empty state (rapid diffs)
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=533645) </details> <!--IssueSummary end--> ### Summary We should render a call to action with the correct text on the rapid diffs empty state (MR page). | current | proposed | | ------ | ------ | | ![Screenshot_2025-03-31_at_11.59.55](/uploads/562ea1297df85fefc453c9cded51a06b/Screenshot_2025-03-31_at_11.59.55.png) | ![Screenshot_2025-04-02_at_13.08.45](/uploads/a3db7b3f72a354f90771bda25309fd89/Screenshot_2025-04-02_at_13.08.45.png) | The following discussion from !186255 should be addressed: - [ ] @jerasmus started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/186255#note_2426182740): > **note:** The secondary text + button need to conditionally render based on where the empty state is rendered. To keep changes to a minimum in this MR, I'm thinking we can add the secondary text and button in a follow-up MR/issue.
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