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-command/src/network/url/join.rs

@@ -100,8 +100,8 @@ impl Command for SubCommand {
                     let url_components = cols
                         .iter()
                         .zip(vals.iter())
-                        .fold(Ok(UrlComponents::new()), |url, (k, v)| {
-                            url?.add_component(k.clone(), v.clone(), span)
+                        .try_fold(UrlComponents::new(), |url, (k, v)| {
+                            url.add_component(k.clone(), v.clone(), span)
                         });
 
                     url_components?.to_url(span)