Review Mozilla 1908788: mach test doesn't work for WebDriver tests on Android

🔍 Bugzilla Audit

Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1908788

Mozilla decided to build geckodriver only for the host.

At a certain point we started building geckodriver for all platforms, hoping it was useful for selenium, for example.

However, I think torbrowser-selenium still uses Mozilla's binaries, so as a matter of fact it isn't needed by them.

Our marionette tests are currently broken, so I don't know if someone is actually consuming it.

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