[PM] Fix A11y issue (1/N)

- Only disable the button when the button is clickable
- Set clickable of the buttons to false to avoid the user clicks the
  buttons twice quickly

Flag: android.content.pm.use_pia_v2
Test: Test it with Talkback
Bug: 437830304
Bug: 420544301
Change-Id: I46052b52294c57f1bee76afb03f9046b3f5e4677