Revert "[ADI][1/N] APIs of verification service, session and status"

FLAG: EXEMPT just revert
BUG: 422535876
Test: n/a just revert

This reverts commit eca9b88d.
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:491e77afd2d1b9b3605cfa770b1cbd0343423133)
Merged-In: I8770051d570e8e2ceaeb1d7822984005cf81a7b7
Change-Id: I8770051d570e8e2ceaeb1d7822984005cf81a7b7