feat: TNL-10136 fix build errors

blank lines in __init__
private method that needed to be public
importlib and importlib-resources dependencies

common/djangoapps/student/models/__init__.py

@@ -3,4 +3,3 @@ Student models migrated to folder to tease out the course enrollment aspects fro
 '''
 from .course_enrollment import *
 from .user import *
-

common/djangoapps/student/models/user.py

@@ -295,7 +295,7 @@ def get_retired_email_by_email(email):
     return user_util.get_retired_email(email, settings.RETIRED_USER_SALTS, settings.RETIRED_EMAIL_FMT)
 
 
-def _get_all_retired_usernames_by_username(username):
+def get_all_retired_usernames_by_username(username):
     """
     Returns a generator of "retired usernames", one hashed with each
     configured salt. Used for finding out if the given username has
@@ -319,7 +319,7 @@ def get_potentially_retired_user_by_username(username):
     does not exist, then any hashed username salted with the historical
     salts.
     """
-    locally_hashed_usernames = list(_get_all_retired_usernames_by_username(username))
+    locally_hashed_usernames = list(get_all_retired_usernames_by_username(username))
     locally_hashed_usernames.append(username)
     potential_users = User.objects.filter(username__in=locally_hashed_usernames)
 
@@ -364,7 +364,7 @@ def get_potentially_retired_user_by_username_and_hash(username, hashed_username)
       does not exist, the any hashed username salted with the historical
       salts.
     """
-    locally_hashed_usernames = list(_get_all_retired_usernames_by_username(username))
+    locally_hashed_usernames = list(get_all_retired_usernames_by_username(username))
 
     if hashed_username not in locally_hashed_usernames:
         raise Exception('Mismatched hashed_username, bad salt?')

common/djangoapps/student/tests/test_retirement.py

@@ -15,6 +15,7 @@ from django.urls import reverse
 
 from openedx.core.djangolib.testing.utils import skip_unless_lms
 from common.djangoapps.student.models import (
+    get_all_retired_usernames_by_username,
     get_potentially_retired_user_by_username,
     get_potentially_retired_user_by_username_and_hash,
     get_retired_email_by_email,