Move some unit tests about WindowInsets to CTS

These tests are about the new insets APIs.

Bug: 152618398
Bug: 152617905
Bug: 152617904
Bug: 152617519
Bug: 152617444
Bug: 152617265
Test: atest WindowInsetsTest
Change-Id: Ie8ecce7b9c93637044055ad271bbc4824b17e814