only run GPU tests on Drone
🚀 Feature

Only run GPU related tests on Drone
Motivation
Currently we run all tests except tpu tests on Drone. Since cpu tests are all tested on various configs in github actions, it would be better to run gpu tests on gpu. If we only run gpu tests on gpu, we can probably run gpu tests with pytorch nightly.
Pitch
To be able to run gpu tests with pytorch nightly
Additional context
#4661 (comment)
cc: @rohitgr7