Apply nightly clippy lints (#9654)

# Description
- A new one is the removal of unnecessary `#` in raw strings without `"`
inside.
-
https://rust-lang.github.io/rust-clippy/master/index.html#/needless_raw_string_hashes
- The automatically applied removal of `.into_iter()` touched several
places where #9648 will change to the use of the record API. If
necessary I can remove them @IanManske to avoid churn with this PR.
- Manually applied `.try_fold` in two places
- Removed a dead `if`
- Manual: Combat rightward-drift with early return

crates/nu-parser/src/parser.rs

@@ -4023,7 +4023,7 @@ fn parse_table_expression(working_set: &mut StateWorkingSet, span: Span) -> Expr
 
     let ty = if working_set.parse_errors.len() == errors {
         let (ty, errs) = table_type(&head, &rows);
-        working_set.parse_errors.extend(errs.into_iter());
+        working_set.parse_errors.extend(errs);
         ty
     } else {
         Type::Table(vec![])
@@ -5039,7 +5039,7 @@ pub fn parse_expression(
                     String::from_utf8(bytes)
                         .expect("builtin commands bytes should be able to convert to string"),
                     String::from_utf8_lossy(match spans.len() {
-                        1 | 2 | 3 => b"value",
+                        1..=3 => b"value",
                         _ => working_set.get_span_contents(spans[3]),
                     })
                     .to_string(),