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/000024_create_audits.up.sql

@@ -0,0 +1,25 @@
+CREATE TABLE IF NOT EXISTS Audits (
+    Id varchar(26) NOT NULL,
+    CreateAt bigint(20) DEFAULT NULL,
+    UserId varchar(26) DEFAULT NULL,
+    Action text,
+    ExtraInfo text,
+    IpAddress varchar(64) DEFAULT NULL,
+    SessionId varchar(26) DEFAULT NULL,
+    PRIMARY KEY (Id)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'Audits'
+        AND table_schema = DATABASE()
+        AND index_name = 'idx_audits_user_id'
+    ) > 0,
+    'SELECT 1',
+    'CREATE INDEX idx_audits_user_id ON Audits(UserId);'
+));
+
+PREPARE createIndexIfNotExists FROM @preparedStatement;
+EXECUTE createIndexIfNotExists;
+DEALLOCATE PREPARE createIndexIfNotExists;