@msuthars , thanks for the review . As you have suggested some changes in #4 ...

@msuthars , thanks for the review . As you have suggested some changes in #4 , can you kindly look my following points

1. In FileWidget file \Drupal::messenger( call is under static method , so no need to replace this.
2. We are replacing IoC injection in non test files only.
3. In PrepareModulesEntityUninstallForm file \Drupal::messenger( call is under static method , so no need to replace this.
4. Same as point 2.
5. Same as point 2.
6. In BatchUserAction \Drupal::messenger( call is under static method , so no need to replace this.