Migrate to cargo_embargo. am: d8b699d629 am: b595bb7179 am: 3cc1f87975

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/libtest-mimic/+/2822772

Change-Id: Idd76fccc165d5097d31af448320e26262477c159
Signed-off-by: Automerger Merge Worker <[email protected]>