## Summary

Some dependencies were originally introduced for only a few specific
functions that can either be fulfilled by existing dependencies or
easily implemented in-tree. This PR removes or replaces them:

1. `json_dotpath`: Removed. We do not use the dot-path query feature;
standard methods in `serde_json` are sufficient for our use case.
2. `crossbeam`: Replaced with the more lightweight `crossbeam-queue`.
3. `take-until`: Removed. Calls to `take_until` are replaced with
`take_while_inclusive` from `itertools`, which is already widely used in
Zed.
4. `x11-clipboard`: Removed. It is deprecated and was only an unused
entry left in `Cargo.toml`.
5. `portable-pty`: Removed. We only used the `ExitStatus` transformation
logic from this crate, which has now been inlined into the Zed codebase.

Together, these changes reduce the total crate count from 1,727 to 1,717
during a Linux `cargo build`, slightly improving compile times.

## Testing

This is a refactoring PR with no functional changes. Existing tests were
run locally to ensure no regressions were introduced.

## Self-review

- [x] I've reviewed my diff for quality, security, reliability, and
performance.
- [ ] UI changes follow the
[checklist](https://zed.dev/docs/development/ui-checklist).
- [ ] Tests cover the new or changed behavior.

Release Notes:

- N/A
- [GPUI] N/A