Stub out install bundle removal API for install bundle sources.
Make install bundle sources gracefully handle bundles that are unkown to them.
[at]Hongyi.Yu [at]Daniel.Lamb
[FYI] [at]Eric.Knapik
#ROBOMERGE-SOURCE: CL 13055207 via CL 13057267 via CL 13057354 via CL 13057430 via CL 13057576
#ROBOMERGE-BOT: RELEASE (Release-Engine-Staging -> Main) (v686-13045012)
[CL 13057630 by justin marcus in Main branch]