fix: Add new proctoring key to Studio devstack & tests envs (copy from LMS) (#26430)

Turns out it's needed for the Proctoring Settings view.

Also reorder slightly for better clustering.

MST-644

cms/envs/test.py

@@ -321,6 +321,10 @@ DEFAULT_MOBILE_AVAILABLE = True
 
 PROCTORING_SETTINGS = {}
 
+# Used in edx-proctoring for ID generation in lieu of SECRET_KEY - dummy value
+# (ref MST-637)
+PROCTORING_USER_OBFUSCATION_KEY = '85920908f28904ed733fe576320db18cabd7b6cd'
+
 ##### LOGISTRATION RATE LIMIT SETTINGS #####
 LOGISTRATION_RATELIMIT_RATE = '5/5m'
 LOGISTRATION_API_RATELIMIT = '5/m'