Revert "do not analyze platformio files"

This reverts commit 55a7926670.

script/clang-tidy

@@ -152,8 +152,6 @@ def run_tidy(executable, args, options, tmpdir, path_queue, lock, failed_files):
         if sys.stdout.isatty():
             invocation.append("--use-color")
 
-        # Exclude PlatformIO files from analysis since we can't fix issues in external code
-        # and they often generate false positives
         invocation.append(
             f"--header-filter=^{os.path.abspath(basepath)}/(?!.*\\.platformio/).*"
         )