Migrate to androidx namespace for support library.

Also, fix the tests so that they point to the correct resources.

Test: build CarSetupWizard and ensured to breakages
Test: build CarSetupSampleOverlay and ensured no breakages
Test: Run setupwizardlib tests.
Bug: 77601495
Change-Id: Ie9a88039f0f049c4f917c1001ba4a669c055690c
Merged-In: Ie9a88039f0f049c4f917c1001ba4a669c055690c
(cherry picked from commit 2b780ca6)
(cherry picked from commit c3eba95f)