Add @test and @Ignore to untested test methods in RequestPinItemTest.

Error prone complains when trying to merge launcher3 code to platform pi-dev.

"This looks like a test method but is not run; please add @test and @Ignore,
or, if this is a helper method, reduce its visibility."

Output:

Executing tasks: [:assembleGoogleDebug, :assembleGoogleDebugAndroidTest]
Gradle build finished in 1s 631ms
Tests Ignored: 1 passed, 4 ignored

Bug: 78589564
Change-Id: Icde57fd8307e1ef409822d1417f629cd1aaa57ba