Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/scripts/jq-dep-check.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+jq_cmd=jq
+[[ $(type -P "$jq_cmd") ]] || { 
+	echo "'$jq_cmd' command line JSON processor not found";
+	echo "Please install on linux with 'sudo apt-get install jq'"
+	echo "Please install on mac with 'brew install jq'"
+	exit 1; 
+}