Remove special-casing for editable requirements (#3869)

## Summary

There are a few behavior changes in here:

- We now enforce `--require-hashes` for editables, like pip. So if you
use `--require-hashes` with an editable requirement, we'll reject it. I
could change this if it seems off.
- We now treat source tree requirements, editable or not (e.g., both `-e
./black` and `./black`) as if `--refresh` is always enabled. This
doesn't mean that we _always_ rebuild them; but if you pass
`--reinstall`, then yes, we always rebuild them. I think this is an
improvement and is close to how editables work today.

Closes #3844.

Closes #2695.

crates/uv-dispatch/src/lib.rs

@@ -199,7 +199,7 @@ impl<'a> BuildContext for BuildDispatch<'a> {
             remote,
             reinstalls,
             extraneous: _,
-        } = Planner::with_requirements(&requirements).build(
+        } = Planner::new(&requirements).build(
             site_packages,
             &Reinstall::None,
             &NoBinary::None,