Autoclick Tests: Create Autoclick panel integration test

Create a new integration test class for the Autoclick panel. Start with
testing the pause button updates when clicked.

Bug: 411187719
Test: atest AutoclickPanelTests
Flag: com.android.server.accessibility.enable_autoclick_indicator
Change-Id: Ib1b8ac3d16b7d4d40552f8070330b25df1bc1508