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/000090_create_enums.up.sql

@@ -0,0 +1,47 @@
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'Channels'
+        AND table_schema = DATABASE()
+        AND column_name = 'Type'
+        AND column_type != 'ENUM("D", "O", "G", "P")'
+    ) > 0,
+    'ALTER TABLE Channels MODIFY COLUMN Type ENUM("D", "O", "G", "P");',
+    'SELECT 1'
+));
+
+PREPARE alterIfExists FROM @preparedStatement;
+EXECUTE alterIfExists;
+DEALLOCATE PREPARE alterIfExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'Teams'
+        AND table_schema = DATABASE()
+        AND column_name = 'Type'
+        AND column_type != 'ENUM("I", "O")'
+    ) > 0,
+    'ALTER TABLE Teams MODIFY COLUMN Type ENUM("I", "O");',
+    'SELECT 1'
+));
+
+PREPARE alterIfExists FROM @preparedStatement;
+EXECUTE alterIfExists;
+DEALLOCATE PREPARE alterIfExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'UploadSessions'
+        AND table_schema = DATABASE()
+        AND column_name = 'Type'
+        AND column_type != 'ENUM("attachment", "import")'
+    ) > 0,
+    'ALTER TABLE UploadSessions MODIFY COLUMN Type ENUM("attachment", "import");',
+    'SELECT 1'
+));
+
+PREPARE alterIfExists FROM @preparedStatement;
+EXECUTE alterIfExists;
+DEALLOCATE PREPARE alterIfExists;