Restructure workflow step resolution and fix inserting newlines (#15720)

Release Notes:

- N/A

---------

Co-authored-by: Nathan <nathan@zed.dev>

crates/text/src/anchor.rs

@@ -136,7 +136,6 @@ where
 
 pub trait AnchorRangeExt {
     fn cmp(&self, b: &Range<Anchor>, buffer: &BufferSnapshot) -> Ordering;
-    fn intersects(&self, other: &Range<Anchor>, buffer: &BufferSnapshot) -> bool;
 }
 
 impl AnchorRangeExt for Range<Anchor> {
@@ -146,8 +145,4 @@ impl AnchorRangeExt for Range<Anchor> {
             ord => ord,
         }
     }
-
-    fn intersects(&self, other: &Range<Anchor>, buffer: &BufferSnapshot) -> bool {
-        self.start.cmp(&other.end, buffer).is_lt() && other.start.cmp(&self.end, buffer).is_lt()
-    }
 }