Revert "into cellpath command (#7417)" (#7523)

This reverts commit f0e93c2fa9 (PR #7417).

I'm currently [working on improving cell
paths](https://github.com/nushell/nushell/issues/7498#issuecomment-1356834798),
and I realized that I would need to make several improvements to `into
cellpath` along the lines of Jakub's comment here:
https://github.com/nushell/nushell/pull/7417#issuecomment-1345264955

I don't think `into cellpath` is quite ready for prime-time, and I'd
like to remove it before the upcoming release.

crates/nu-command/src/default_context.rs

@@ -371,7 +371,6 @@ pub fn create_default_context() -> EngineState {
             IntoDuration,
             IntoFilesize,
             IntoInt,
-            IntoCellPath,
             IntoRecord,
             IntoString,
         };