Why: denoise was used on the "new" removed audio pipeline. While we will
(hopefully) reintroduce that later it is currently dead code! Worse dead
code causing issues as the denoise crate breaks compilation on old arm
targets.

denoise (through candle-core) eventually depends on gemm which does not
compile on older arm targets. This is a known issue in gemm (see
sarah-quinones/gemm#31).

Hopefully this will be addressed in gemm before we re-land denoise/new
audio. If it is not we can always compile denoise only for supported
platforms.

Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

Closes #57770

Release Notes:

- Fixed Zed not compiling on pre ARMv8.2-A machines