Make unicode-xid available to product and vendor am: 348239c2ce am: ec43450fa8 am: 7d2ba533b4 am: 15449292b4

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/unicode-xid/+/2475808

Change-Id: I40569336fa0df4fef3d02cb95d027400a25a87db
Signed-off-by: Automerger Merge Worker <[email protected]>