refactor: replace User.objects.create_user for UserFactory p2

[mariajgrimaldi]

This change is done, so the profile is automatically created for tests users. PR continuation of PR 28525

Supporting information

This was discussed -here- after we encountered some errors while using the user's profile in some tests. For example, here:
https://build.testeng.edx.org/job/edx-platform-python-pipeline-pr/33777/
More in detail:
https://build.testeng.edx.org/job/edx-platform-python-pipeline-pr/33777/testReport/junit/cms.djangoapps.contentstore.management.commands.tests.test_create_course/TestCreateCourse/Run_Tests___cms_unit___test_duplicate_course/

Testing instructions

Run edxapp tests:

1. Run specific tests:
   pytest lms/djangoapps/course_goals/tests/test_goals.py::TestCourseGoalsAPI::test_add_goal
2. Run specific test suit: paver test_js_run -s <lms|cms>

Deadline

"None"

Other information

This PR just improves tests by adding missing data. This time there are no more references to User.objects.create_user in tests, just where is required.

[openedx-webhooks]

Thanks for the pull request, @mariajgrimaldi! I've created OSPR-5990 to keep track of it in JIRA, where we prioritize reviews. Please note that it may take us up to several weeks or months to complete a review and merge your PR.

Feel free to add as much of the following information to the ticket as you can:

• supporting documentation
• Open edX discussion forum threads
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Please let us know once your PR is ready for our review and all tests are green.

[felipemontoya]

Great work @mariajgrimaldi.

[felipemontoya]

Given that this is only maintenance It should be fine to merge it with only one CC. However I'll wait till monday morning to not trigger deployments on a Friday evening

[edx-status-bot]

Your PR has finished running tests. There were no failures.

[felipemontoya]

Now we are good to merge

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the staging environment in preparation for a release to production.

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the production environment.

[natabene]

@mariajgrimaldi @felipemontoya thank you both!

[openedx-webhooks]

@mariajgrimaldi 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.