Propagate strict_updatability_linting to transitive deps of updatable apexes

Create a topdown mutator to walk the deps of updatable apexes. If a dep
is lintable, set its strictUpdatabilityLinting to true

Creating a new mutator after apexInfoMutator makes it easy to maintain
an allowlist (e.g. override_apex does not require an entry in the
allowlist, its canonical name can be retrieved using ApexVariationName())

Test: In build/soong/, go test ./apex
Test: TH
Bug: 182349282

Change-Id: I1b390b0e3a8fb20754ce50c6b253d68d2b3f263b