Add start info test for custom process name Add test covering the start of an activity with a custom process name and ensuring that a start info record is created and can be accessed. Refactor fields into shared helper for use in both test activities. Bug: 443344191 Test: atest ActivityManagerAppStartInfoTest with flag enabled and disabled Flag: EXEMPT - new test only Change-Id: I86e9eda9b30b85f06dc0c06c5d36b35220a23019