Remove AnyVariantDirectlyInAnyApex

AnyVariantDirectlyInAnyApex requires modifying dependencies
(earlier variants).  It is only used in NotInPlatform to
detemrine if a module is provided by an apex, but it also checks
apex_available for //apex_available:platform, which is mostly
the same.

Bug: 372543712
Test: builds
Test: all apex tests pass
Change-Id: If0134ced7f802ca67c5ab576ffac7e04d5e150b9