Change hwui_unit_tests (and benchmarks) to push to non-root writable dir

...and switch to more appropriate "general-tests" suite type.

This allows the test suite to be run in certain lab/infra scenarios,
like on ABTD.

Docs
device-tests to general-tests:
https://source.android.com/docs/core/tests/development/test-mapping#packaging_build_script_rules

Tests
Without this change:
https://android-build.googleplex.com/builds/abtd/run/L10000000957295240
(tooling fails to push content)
With this change:
https://android-build.googleplex.com/builds/abtd/run/L52900000957292742
(gets past tooling failure, and fails on an actually failing unit test)

Test: compare ABTD runs with and without this CL
Bug: 257123741
Change-Id: I33696a0f1c9279622138e4dc4c49d73c99f359eb