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/mysql/000029_create_bots.up.sql

@@ -0,0 +1,24 @@
+CREATE TABLE IF NOT EXISTS Bots (
+    UserId varchar(26) NOT NULL,
+    Description text,
+    OwnerId varchar(190) DEFAULT NULL,
+    CreateAt bigint(20) DEFAULT NULL,
+    UpdateAt bigint(20) DEFAULT NULL,
+    DeleteAt bigint(20) DEFAULT NULL,
+    PRIMARY KEY (UserId)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'Bots'
+        AND table_schema = DATABASE()
+        AND column_name = 'LastIconUpdate'
+    ) > 0,
+    'SELECT 1',
+    'ALTER TABLE Bots ADD LastIconUpdate bigint;'
+));
+
+PREPARE alterIfNotExists FROM @preparedStatement;
+EXECUTE alterIfNotExists;
+DEALLOCATE PREPARE alterIfNotExists;