[Autofill CredMan] Tests for autofill changes for CredMan.

Test: atest android.autofillservice.cts.dialog.LoginActivityTest#testCredentialManagerIntegration --iterations=10
Test: atest android.autofillservice.cts.dialog.LoginActivityTest#testIsCredential

Bug: 261045584

Change-Id: I5332f60675d8971bded285dfdc95b18dd079b5a2
7 files changed