Deprecate a bunch of VDM APIs.

Activity allow/blocklisting is handled by the activity policy and
allows for dynamic updates of the policy exemptions.

Cross-task navigations has never been used, adds a lot of complexity
and there are a number of issues whose fixes require a ton of more
complexity.

Fix: 298298131
Fix: 299053805
Test: presubmit
Change-Id: Iac4cda9e3cc252a4ae69871cf5962dcad8ff5eea