Merge branch 'aws-override-collab-ff' into 'master'

Added an ability to override the collaboration feature flag via an environment variable.

See merge request !706

provider/search-aws/src/main/resources/application.properties

@@ -77,4 +77,4 @@ featureFlag.strategy=appProperty
 featureFlag.autocomplete.enabled=true
 
 #Collaboration context feature flag name : properties specific
-collaborations-enabled=true
+collaborations-enabled=${COLLABORATION_FF_ENABLED:true}