config: remove VCS_RELEASE_CLASS

* We are making Invenio-VCS optional and therefore we cannot reference a
class that would crash the application if Invenio-VCS is not present.

Author: palkerecsenyi

invenio_app_rdm/config.py

@@ -83,7 +83,6 @@
 from invenio_rdm_records.services.permissions import RDMRequestsPermissionPolicy
 from invenio_rdm_records.services.stats import permissions_policy_lookup_factory
 from invenio_rdm_records.services.tasks import StatsRDMReindexTask
-from invenio_rdm_records.services.vcs.release import RDMVCSRelease
 from invenio_records_resources.references.entity_resolvers import ServiceResultResolver
 from invenio_requests.notifications.builders import (
     CommentRequestEventCreateNotificationBuilder,
@@ -1480,13 +1479,6 @@ def github_link_render(record):
 }
 
 
-# Invenio-VCS
-# =================
-#
-VCS_RELEASE_CLASS = RDMVCSRelease
-"""Default RDM release class."""
-
-
 # Flask-Menu
 # ==========
 #