Rollup merge of #108778 - jyn514:quiet-fmt, r=albertlarsan68

x fmt: Don't print all modified files if there's more than 10

This avoids spam for dozens of modified files.

Fixes https://github.com/rust-lang/rust/issues/106920.

src/bootstrap/format.rs

@@ -165,8 +165,14 @@ pub fn format(build: &Builder<'_>, check: bool, paths: &[PathBuf]) {
             if !CiEnv::is_ci() && paths.is_empty() {
                 match get_modified_rs_files(build) {
                     Ok(Some(files)) => {
-                        for file in files {
+                        if files.len() <= 10 {
+                            for file in &files {
                                 println!("formatting modified file {file}");
+                            }
+                        } else {
+                            println!("formatting {} modified files", files.len());
+                        }
+                        for file in files {
                             ignore_fmt.add(&format!("/{file}")).expect(&file);
                         }
                     }