Adding Prework for Private Space integration in Launcher

This Cl adds the following:
1. Fixes for Quite Mode check maintained by Launcher
2. Addition of new Quite Mode broadcasts
3. Fixes for determining work profile user correctly.

Flag: ACONFIG com.android.launcher3.Flags.enable_private_space DEVELOPMENT
Bug: 289223923
Test: Ran Launcher3 tests
Change-Id: I5f6158b213723339e70ff99e66c5f439f5879e12