Remove the check and warning for master branch usage

src/Command/InstallCommand.php

@@ -62,17 +62,6 @@ protected function configure(): void
  $extra = getenv('EXTRA_PLUGINS_DIR') !== false ? getenv('EXTRA_PLUGINS_DIR') : null;
  $node = getenv('NODE_VERSION') !== false ? getenv('NODE_VERSION') : null;
 
- // Emit a warning/annotation under GHA if the branch is master (recommending to move to main).
- // @codeCoverageIgnoreStart
- if (getenv('GITHUB_ACTIONS')) { // Only show annotations in GitHub Actions.
- if ($branch === 'master') { // And only if the branch being used is master.
- echo '::warning title=`master` branch use detected::The `master` branch of Moodle has been ' .
- 'moved to `main` and will stop working soon. Please consider moving to `main` in your ' .
- 'workflows. Ref.: MDLSITE-7418' . PHP_EOL;
- }
- }
- // @codeCoverageIgnoreEnd
-
  // As there is not only Travis CI, it can also be passed a generic environment variable.
  if (null === $plugin) {
  $plugin = getenv('CI_BUILD_DIR') !== false ? getenv('CI_BUILD_DIR') : null;