Co-authored-by: Smit Barmase <heysmitbarmase@gmail.com>

We've decided to remove rodio backend for audio as we didn't have time
to get it to a nice spot. I personally believe we should eventually
re-land it (the composable pipelines are quite nice!), but given that we
need audio to work, this seems like the best way forward. We won't have
to worry about all the ways in which the legacy pipeline interoped with
rodio's.

## Self-Review Checklist

<!-- Check before requesting review: -->
- [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

Release Notes:

- audio: Experimental rodio audio backend has been removed.

---------

Co-authored-by: Smit Barmase <heysmitbarmase@gmail.com>
Co-authored-by: Yara <git@yara.blue>