Support loading environment from plan9 `rc` shell (#33599)
Closes: https://github.com/zed-industries/zed/issues/33511
Add support for loading environment from Plan9 shell
Document esoteric shell behavior.
Remove two useless tests.
Follow-up to:
- https://github.com/zed-industries/zed/pull/32702
- https://github.com/zed-industries/zed/pull/32637
Release Notes:
- Add support for loading environment variables from Plan9 `rc` shell.
861ca05fb9Peter Tripp committed on 7/7/2025, 2:56:38 PM· committed by GitHubparentf785853