MR Review Panel: Improve review submission form layout
# Context In the context of the wider effort to build an improved MR Review Panel as described in https://gitlab.com/groups/gitlab-org/-/epics/14651 and https://gitlab.com/gitlab-org/gitlab/-/issues/474794, this is step 1. * Step 1: Review bar :arrow_left: this issue (https://gitlab.com/gitlab-org/gitlab/-/issues/525839) * Step 2: New drawer to preview Review pending comments (https://gitlab.com/gitlab-org/gitlab/-/issues/525841) * Step 3-?: Iterate on improving drawer (future issues) This issue covers the improving of the form used to submit a review (after clicking Finish Review) # Tasks 1. Change radio buttons and submit into 3 buttons 1. Approve - Tooltip: "Submit feedback and approve this merge request." 3. Request changes - Tooltip: "Submit feedback that should be addressed before merging." 5. Comment - Tooltip: "Submit feedback without explicit approval." 1. Move delete pending comments button into the review popover # Mockup [Figma](https://www.figma.com/design/4KVQUkUDoZilkO4D1o1bvw/Merge-request?m=auto&node-id=12699-218892&t=sr1j2nuJokCVvOfE-1) | Before | After (this issue) | | ------ | ------ | | ![Screenshot_2025-03-19_at_15.50.16](/uploads/de9b619d945d1c7e0370c3579b650264/Screenshot_2025-03-19_at_15.50.16.png) | ![image](/uploads/c5f44ee534462bdc93b7811b2d7c8aea/image.png) | # Implementation plan These changes can be shipped independently of the other issues (listed in the context section of this description). (to be confirmed by @mle)
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