Block intents with action set as null

During intent resolution, stop matching intents if the provided action
is set as null.

The enforcement is disabled and the logic is for metrics collection and
new strict mode violations.

Bug: 293560872
Test: atest CtsContentTestCases:ContextTest#testRegisterReceiverNullActions
Test: atest CtsPackageManagerTestCases:PackageManagerTest#testNullActionMatching
Change-Id: I78ebc3809894acaf58711df9897867c72bc87084