Move WindowStateTests into flaky one

The test is flaky during set up. Make use doNothing in extendedMockito
to further monitor and debug purpose.

testLayoutSeqResetOnReparent and
testDisplayCutoutIsCalculatedRelativeToFrame is flaky for different
reason. Mark with a seperate bug ID.

Bug: 124127512
Test: None
Change-Id: Ie1a4f6e106497f572248313fcbc6973a453722b8