fix: remove references to edX from bulk emails

Bulk course emails used to contain many references to edX. This is
resolved here by switching to edx-ace for sending emails.

See:
openedx/wg-build-test-release#100
https://edx.readthedocs.io/projects/edx-platform-technical/en/latest/featuretoggles.html#featuretoggle-BULK_EMAIL_SEND_USING_EDX_ACE
openedx/edx-platform#29900

CHANGELOG-nightly.md

@@ -2,6 +2,7 @@
 
 Note: Breaking changes between versions are indicated by "💥".
 
+- [Bugfix] Remove edX references from bulk emails ([issue](https://github.com/openedx/build-test-release-wg/issues/100)).
 - [Bugfix] Update ``celery`` invocations for lms-worker and cms-worker to be compatible with Celery 5 CLI.
 - [Improvement] Point CMS at its config file using ``CMS_CFG`` environment variable instead of deprecated ``STUDIO_CFG``.
 - [Bugfix] Start MongoDB when running migrations, because a new data migration fails if MongoDB is not running

tutor/templates/apps/openedx/settings/partials/common_lms.py

@@ -20,6 +20,7 @@
 
 # Email settings
 DEFAULT_EMAIL_LOGO_URL = LMS_ROOT_URL + "/theming/asset/images/logo.png"
+BULK_EMAIL_SEND_USING_EDX_ACE = True
 
 # Create folders if necessary
 for folder in [DATA_DIR, LOG_DIR, MEDIA_ROOT, STATIC_ROOT_BASE, ORA2_FILEUPLOAD_ROOT]: