Centralize the CopyPath and CopyRelativePath actions to zed_actions (#24836)

I spent an hour with @marcospb19 this morning debugging an issue with
adding `Copy Path` and `Copy Relative Path` actions to the editor
context menu. Turned out that the problem was using
`workspace::CopyPath` in the menu and `editor::CopyPath` in the action
handler.

This is an easy mistake to make, so let's fix it for everyone.

Release Notes:

- N/A

crates/editor/src/actions.rs

@@ -267,9 +267,7 @@ gpui::actions!(
         CopyHighlightJson,
         CopyFileName,
         CopyFileNameWithoutExtension,
-        CopyPath,
         CopyPermalinkToLine,
-        CopyRelativePath,
         Cut,
         CutToEndOfLine,
         Delete,