Lambdas were used to ensure consistent locking around the snapshot,
but since it's impossible to lock the snapshot now, this is no longer
necessary, and all methods should just store a reference.
Also migrates DomainVerificationService off PackageSetting lambdas,
which cleans up a lot of extra emthods.
Bug: 215403184
Test: atest com.android.server.pm.verify.domain
Test: atest SuspendPackageHelperTest
Change-Id: Ib4e3442e5c16e935b14b8421fbc33adff65dcf68
664792c231