Disable overlay app notification launch flicker tests

These tests do not currently have any animated notification launch due to the keyguard being occluded. In order to instrument these correctly, we would need to have a correct animation and CUJ for this scenario.

Bug: 294418322
Bug: 290577455
Test: only disabling tests
Change-Id: I92f9d3e21d77f153bd5ff631c17e0d461818394a