Don't build automatic RROs for tests

Automatic RROs don't make sense for tests, the tests can't rely on
overlays being installed on product or vendor.  Creating the RROs
causes a race during builds that build both droid and device-tests
goals, as the RROs may be installed to the vendor directory as a
dependency of the device-tests goal before or after the vendor image
is packaged as a dependency of the droid goal.  If the RROs are
installed first and the vendor image is low on space it may result
in an out-of-space error.

Bug: 282885159
Test: Rule to build $OUT/vendor/overlay/SystemUITests__*__auto_generated_rro_vendor.apk no longer exists
Change-Id: I760355ffb1818e91c02a98473312f9f21c149361
Merged-In: I760355ffb1818e91c02a98473312f9f21c149361