Add 2 additional "stable" patch/diff links to the MR "Code" dropdown
<!--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=558738) </details> <!--IssueSummary end--> This issue adds a UI for the recently implemented feature at #217206 My use case there is to get a diff which represents the current state of the MR (and won't change in the future). That Compare URL is a hard to build right now. I propose we rename the links in the screenshot below and add two new ones (i.e. the 'stable' links). 1. Patches (dynamic) 2. Patches (stable) 3. Plain diff (dynamic) 4. Plain diff (stable) ![Screenshot_2025-07-31_at_1.08.12_PM](/uploads/50a2343beca4039defb54e69a4aa8baf/Screenshot_2025-07-31_at_1.08.12_PM.png)
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