Bug 1938924 - Add support for search-config-overrides-v2 to the Rust…

[mandysGit]

… based search engine selector.

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Branch builds: add [firefox-android: branch-name] to the PR title.

[mandysGit]

I updated the patch to fix the failing tests. I didn't notice them when I first push this up.

[Standard8]

Thank you, this is a good start and looks like it will fix some more of the desktop tests 🎉

A few things to consider that I've added in-line.

[Standard8]

Thank you, this looks good. One comment to consider. AFAIK mobile hasn't landed anything using this yet, so the types.rs change shouldn't need to count as breaking API.