One big cleanup pass of clippy lints

Co-authored-by: Mikayla <mikayla@zed.dev>

crates/project/src/search.rs

@@ -53,7 +53,7 @@ impl SearchQuery {
             query = word_query
         }
 
-        let multiline = query.contains("\n") || query.contains("\\n");
+        let multiline = query.contains('\n') || query.contains("\\n");
         let regex = RegexBuilder::new(&query)
             .case_insensitive(!case_sensitive)
             .multi_line(multiline)