We add "trunk_staging-" for all COMMON_LUNCH_CHOICES so they are
valid in the trunk stable setup.
Bug: 307738446
Test: lunch
Change-Id: I441fde351191dfa28e48a54538249be57310971f
based on pipit 68a0b4b411e8d23dfd966d24a5c35ea4ffb9d5f1
and cheetah 9acaa7507c23ffc7ca5f82a9579dd3a7c56af809
Bug: 206057564
Change-Id: Id59ed48d2a39c9a5a811c41157732914f3568d51