Revert "Enable metalava sandbox in StubLibraries.bp and ApiDocs.bp."

Reason for revert: breaking several builds downstream
Reverted Changes:
Ia5767debc:Enable metalava sandbox in StubLibraries.bp and Ap...
I7256d29f1:Add sandbox property to the javadoc rule.
Ia69440800:Only report a violation when the file exists.

Change-Id: I5651212314fd39b7ba404936dee416f566c682c9
2 files changed