feat(scripts/lint-style): more useful line numbers (#12282)

This changes slighlty the output of the linter from
```
[...]Mathlib/My/File.lean#L285: ERR_LIN: Line has more than 100 characters
```
to
```
[...]Mathlib/My/File.lean:285 ERR_LIN: Line has more than 100 characters
```

If one then copies the path with the line number and uses that when opening the file in vs code with Ctrl-p, it will set to cursor to the correct line number in question. Also other tools will work with that format, it is also used by pylint, clang etc.




Co-authored-by: Moritz Firsching <firsching@google.com>

scripts/lint-style.py

@@ -359,7 +359,7 @@ def output_message(path, line_nr, code, msg):
             msg_type = "warning"
         # We are outputting for github. We duplicate path, line_nr and code,
         # so that they are also visible in the plaintext output.
-        print(f"::{msg_type} file={path},line={line_nr},code={code}::{path}#L{line_nr}: {code}: {msg}")
+        print(f"::{msg_type} file={path},line={line_nr},code={code}::{path}:{line_nr} {code}: {msg}")
 
 def format_errors(errors):
     global new_exceptions