Draft: 40123: Allow building instrumented tests for variants other than debug

Alex Catarineurequested to merge
acat/fenix:40123 into tor-browser-83.1.0-10.5-1

Closes #40123 (closed).

The okio dependency patch should not be needed for 84, so I'm not sure if it's worth to target 84 for this and drop that patch.

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