Display loader and disable input while explain code is being is being generated
<!--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> - [Work on this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=439975) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=439975) </details> <!--IssueSummary end--> ### Summary In https://gitlab.com/gitlab-org/gitlab/-/merge_requests/143217 we updated the Explain code feature to use the Duo Chat component. This issue suggests displaying a loader and disabling user input while the answer is being generated. ### Proposal | before | after | | ------ | ------ | | ![Screenshot_2024-02-01_at_09.49.26](/uploads/999bb0a9ef2871a74805898e76a51a6d/Screenshot_2024-02-01_at_09.49.26.png) | ![Screenshot_2024-02-01_at_09.49.54](/uploads/d588048287d1807622d38b8778e63fd6/Screenshot_2024-02-01_at_09.49.54.png) |
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