never print the warning on CI

Author: lolbinarycat

src/bootstrap/src/core/build_steps/format.rs

@@ -114,7 +114,7 @@ fn print_paths(verb: &str, adjective: Option<&str>, paths: &[String]) {
 }else{
 println!("fmt: {verb} {len} {adjective}files");
 }
-if len > 1000{
+if len > 1000&& !CiEnv::is_ci(){
 println!("hint: if this number seems too high, try running `git fetch origin master");
 }
 }