DEV: Deprecate message bus site settings...

DEV: Deprecate message bus site settings (https://github.com/discourse/discourse/commit/fa3c4ad28b3c0d5690fbc4618da7a7a4ba6f684f)

config/discourse.conf

@@ -322,6 +322,12 @@ cluster_name =
 # The YAML file used to configure multisite clusters
 multisite_config_path = "config/multisite.yml"
 
+# If false, only short (regular) polling will be attempted
+enable_long_polling =
+
+# Length of time to hold open a long polling connection in milliseconds
+long_polling_interval =
+
 # Set trusted ip's for prometheus.
 # Check standard nodes ips.
 prometheus_trusted_ip_allowlist_regex = '(::ffff:188\.18[4-5])|(::ffff:137\.138)'
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