Remove legacy IntentFilterVerificationManager

Completely deletes all the code for v1 of domain verification,
delegating everything to the new DomainVerificationService.

Exempt-From-Owner-Approval: Already approved by owners on main branch

Bug: 171251883

Test: none, removal of effectively dead code

Change-Id: Ib222ccd46019c1c28b402c0f68466077b62871c1
20 files changed