Add permissions for AppFunctionManagerTest to Shell.

This change grants the following permissions to shell:
- android.permission.EXECUTE_APP_FUNCTIONS_TRUSTED
- android.permission.EXECUTE_APP_FUNCTIONS

Bug: 357551503
Change-Id: If7f84e2621335378e35cba3b778ccfdddb3ed528
Test: atest AppFunctionManagerTest
Flag: EXEMPT Change adds permissions to Shell.