feat: pdf block enabled by default (#38870)

This PR enables the PDF block by default in all courses. It is
listed under the the Advanced component category.

Before this commit, course authors needed to add it to the
Advanced module list in Advanced Settings first.

https://openedx.atlassian.net/wiki/spaces/OEPM/pages/5335908397

Backports f4cba03

Author: Kelketek

cms/djangoapps/contentstore/views/component.py

@@ -77,6 +77,7 @@
     'google-calendar',
     'google-document',
     'lti_consumer',
+    'pdf',
     'poll',
     'split_test',
     'survey',

cms/djangoapps/contentstore/views/tests/test_block.py

@@ -2806,6 +2806,7 @@ def setUp(self):
             "Google Calendar",
             "Google Document",
             "LTI Consumer",
+            "PDF",
             "Poll",
             "Content Experiment",
             "Survey",

cms/envs/common.py

@@ -938,7 +938,7 @@ def make_lms_template_path(settings):
     {
         'component': 'staffgradedxblock',
         'boilerplate_name': None
-    }
+    },
 ]
 
 LIBRARY_BLOCK_TYPES = [