Remove nu-glob's dependency on nu-protocol (#15349)

# Description

This PR solves a circular dependency issue (`nu-test-support` needs
`nu-glob` which needs `nu-protocol` which needs `nu-test-support`). This
was done by making the glob functions that any type that implements
`Interruptible` to remove the dependency on `Signals`.

# After Submitting

Make `Paths.next()` a O(1) operation so that cancellation/interrupt
handling can be moved to the caller (e.g., by wrapping the `Paths`
iterator in a cancellation iterator).

crates/nu-protocol/src/pipeline/signals.rs

@@ -1,11 +1,11 @@
 use crate::{ShellError, Span};
+use nu_glob::Interruptible;
+use serde::{Deserialize, Serialize};
 use std::sync::{
     atomic::{AtomicBool, Ordering},
     Arc,
 };
 
-use serde::{Deserialize, Serialize};
-
 /// Used to check for signals to suspend or terminate the execution of Nushell code.
 ///
 /// For now, this struct only supports interruption (ctrl+c or SIGINT).
@@ -84,6 +84,13 @@ impl Signals {
     }
 }
 
+impl Interruptible for Signals {
+    #[inline]
+    fn interrupted(&self) -> bool {
+        self.interrupted()
+    }
+}
+
 /// The types of things that can be signaled. It's anticipated this will change as we learn more
 /// about how we'd like signals to be handled.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]