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/channels/db/migrations/postgres/000093_notify_admin.up.sql

@@ -0,0 +1,8 @@
+CREATE TABLE IF NOT EXISTS NotifyAdmin (
+    UserId varchar(26) NOT NULL,
+    CreateAt bigint DEFAULT NULL,
+    RequiredPlan varchar(26) NOT NULL,
+    RequiredFeature varchar(100) NOT NULL,
+    Trial BOOLEAN NOT NULL,
+    PRIMARY KEY (UserId, RequiredFeature, RequiredPlan)
+);