feat: Add Django Setting for viewing exam content (#27863)

MST-846. We no longer want proctored exam content to be viewable past the exam's due date. This behavior is now controlled by a django setting, so other instances of open edX can choose to turn it on/off.

lms/envs/common.py

@@ -4653,6 +4653,8 @@ PROCTORING_BACKENDS = {
     'null': {}
 }
 
+PROCTORED_EXAM_VIEWABLE_PAST_DUE = False
+
 ############### The SAML private/public key values ################
 SOCIAL_AUTH_SAML_SP_PRIVATE_KEY = ""
 SOCIAL_AUTH_SAML_SP_PUBLIC_CERT = ""

lms/envs/production.py

@@ -626,6 +626,9 @@ SESSION_INACTIVITY_TIMEOUT_IN_SECONDS = AUTH_TOKENS.get("SESSION_INACTIVITY_TIME
 TIME_ZONE_DISPLAYED_FOR_DEADLINES = ENV_TOKENS.get("TIME_ZONE_DISPLAYED_FOR_DEADLINES",
                                                    TIME_ZONE_DISPLAYED_FOR_DEADLINES)
 
+#### PROCTORED EXAM SETTINGS ####
+PROCTORED_EXAM_VIEWABLE_PAST_DUE = ENV_TOKENS.get('PROCTORED_EXAM_VIEWABLE_PAST_DUE', False)
+
 ##### Third-party auth options ################################################
 ENABLE_REQUIRE_THIRD_PARTY_AUTH = ENV_TOKENS.get('ENABLE_REQUIRE_THIRD_PARTY_AUTH', False)