Improve mirror SSH host key detect/manual buttons UX
<!--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=10970) </details> <!--IssueSummary end--> In https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/10355#note_157915592 @cperessini mentioned that the "Detect host keys" and "Input host keys manually" buttons could be improved. > Are the 'detect' and 'input manually' buttons mutually exclusive? Does it make sense then to have the two buttons side by side ('`Detect host keys` or `Input host keys manually`) and replace the content below depending on which is clicked?
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