Merge "Support fetching config files from experiments fetcher binary" am:...

Merge "Support fetching config files from experiments fetcher binary" am: dedd43c7 am: 5965fcc0 am: 35333960 am: 9973f67a

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1962540

Change-Id: Ia13f73a6231df6875f9c44f71383e21f26042f12