Autofill For All Apps - refactor to have important and not impotant views call...

Autofill For All Apps - refactor to have important and not impotant views call the same isAutofillable() function in AutofillManager

We couldn't change the flag name for denylist because we don't want to suddenly turn down AFAA on droidfood population. So for now we will use the old flag name, but the denylist
would also be applied to important views.

bug: 265186343
Test: atest AutofillForAllAppsTest

Change-Id: I2bd1d1ccd2e939a512297da74106284293685620