Migrate to cargo_embargo. am: d8b699d629 am: 935d9f29d0 am: 8980b854b0

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

Change-Id: Ieda2d080ff36b20b43776579d4113b056b0c368e
Signed-off-by: Automerger Merge Worker <[email protected]>