Improve external quoting logic (#3579)

* Add tests and improve quoting logic

* fmt

* Fix clippy ling

* Fix clippy ling

crates/nu-protocol/src/value/column_path.rs

@@ -199,7 +199,6 @@ fn trim_quotes(input: &str) -> String {
     match (chars.next(), chars.next_back()) {
         (Some('\''), Some('\'')) => chars.collect(),
         (Some('"'), Some('"')) => chars.collect(),
-        (Some('`'), Some('`')) => chars.collect(),
         _ => input.to_string(),
     }
 }