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6efa5113 - Reduce cache contention due to `RUST_BACKTRACE` environment variable (#17451)

Reduce cache contention due to `RUST_BACKTRACE` environment variable (#17451) This is included in the Rust cache key hash because it is prefixed with `RUST_` but has no affect on compilation. This invalidates caches that could be shared across jobs. --------- Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>