Use startActivityAsUser instead of startActivity API to start the AppLocalePickerActivity of different users
Bug: 274378136
Test: 1. Perform AppLocalePickerActivityTest robolectric test
2. Perform the manual test by switching different users
3. Perform the manual test by switching different profiles
Change-Id: I4405b3b7e832b71b9ef66fa71d9e42ce12da167c
Examine whether the packages is allowed to display app locales list when creating the AppLocalePickerActivity, and examine whether the target user is the same as the calling user.
Bug: 257954050
Test: Follows the test step listed in b/257954050#comment14
Change-Id: I2e25a308bcba6ea0edee89c7a78465f766bdbeac