Revert "Reapply "Add target definition needed for Rust 1.83 update""

Revert submission 3462981-rust-toolchain-filegroup

Reason for revert: A simpler solution was implemented in the Rust toolchain build script

Reverted changes: /q/submissionid:3462981-rust-toolchain-filegroup

Change-Id: I7642413e212ca1b964bf67ff83bc92bbcff95676
5 files changed