refactor: Enable the Extracted HTML XBlock (#37669)

In this commit we are rolling out the Extracted HTML XBlock by toggling the
USE_EXTRACTED_HTML_BLOCK flag to True.

Note: The HTML Block subclasses (StaticTab, About, CourseInfo) still use the
built-in code. We'll update it to use the extracted code in a separate PR.

Part of: #37254

Author: ttqureshi

openedx/envs/common.py

@@ -1706,7 +1706,7 @@ def _make_locale_paths(settings):
 # .. toggle_warning: Not production-ready until relevant subtask https://github.com/openedx/edx-platform/issues/34827 is done.
 # .. toggle_creation_date: 2024-11-10
 # .. toggle_target_removal_date: 2025-06-01
-USE_EXTRACTED_HTML_BLOCK = False
+USE_EXTRACTED_HTML_BLOCK = True
 
 # .. toggle_name: USE_EXTRACTED_DISCUSSION_BLOCK
 # .. toggle_default: False