Adjust the context menu z-index relatively to the screenshot overlay

As a follow-up to #3073 , I noticed that the screenshot overlay was going on top of the context menu. Increasing the z-index in ContextMenu.css wasn't enough to fix it.

[deploy preview for #3073](https://deploy-preview-3073--perf-html.netlify.app/public/36d6d200bb8ec4eff5a90044dc066063703edf6a/calltree/?globalTrackOrder=450w3&localTrackOrderByPid=39199-0~39202-0~39200-0~39201-0&thread=0&timelineType=category&v=11)

<img width="446" height="413" alt="Image" src="https://github.com/user-attachments/assets/2aab7d31-8293-4e7e-a361-f2b948779c8a" />

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-918)


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Adjust the context menu z-index relatively to the screenshot overlay #5513

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Adjust the context menu z-index relatively to the screenshot overlay #5513

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