fix: allow users who can create orgs to see the full list of orgs when creating a course [FC-0076] (#1689)

The fixes for https://github.com/openedx/frontend-app-authoring/issues/1577 caused issues with edx.org's Global Staff users not being able to create courses. edx.org/2U Global Staff are seeing an empty Organization drop-down list.

This issue arose due to misuse of two similarly-named flags returned by the contentstore's home API

* `can_create_organizations`: granted to Global Staff or everyone if `FEATURES[ENABLE_CREATOR_GROUP] == True`, 
* `allow_to_create_new_org`: which is actually about auto-creating organizations, so both `can_create_organizations` + `settings.ORGANIZATIONS_AUTOCREATE` must be True

In this change, we use `canCreateOrganizations` to decide whether the user can see the full list of organizations when creating courses. We preserve the use of `allowToCreateNewOrg`  when deciding whether to allow users to "typeahead" to create a new organization not in the drop-down list.

src/generic/create-or-rerun-course/hooks.jsx

@@ -27,12 +27,12 @@ const useCreateOrRerunCourse = (initialValues) => {
   const allOrganizations = useSelector(getOrganizations);
   const postErrors = useSelector(getPostErrors);
   const {
-    allowToCreateNewOrg,
+    canCreateOrganizations,
     allowedOrganizations,
   } = useSelector(getStudioHomeData);
   const [isFormFilled, setFormFilled] = useState(false);
   const [showErrorBanner, setShowErrorBanner] = useState(false);
-  const organizations = allowToCreateNewOrg ? allOrganizations : allowedOrganizations;
+  const organizations = canCreateOrganizations ? allOrganizations : allowedOrganizations;
 
   const { specialCharsRule, noSpaceRule } = REGEX_RULES;
   const validationSchema = Yup.object().shape({
@@ -78,7 +78,7 @@ const useCreateOrRerunCourse = (initialValues) => {
   });
 
   useEffect(() => {
-    if (allowToCreateNewOrg) {
+    if (canCreateOrganizations) {
       dispatch(fetchOrganizationsQuery());
     }
   }, []);

src/studio-home/__mocks__/studioHomeMock.js

@@ -26,7 +26,7 @@ module.exports = {
       cmsLink: '//localhost:18010/courses/course-v1:Design+123+e.g.2025',
     },
   ],
-  canCreateOrganizations: true,
+  canCreateOrganizations: false,
   courseCreatorStatus: 'granted',
   courses: [
     {