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/000090_create_enums.up.sql

@@ -0,0 +1,44 @@
+DO
+$$
+BEGIN
+  IF NOT EXISTS (SELECT * FROM pg_type typ
+                            INNER JOIN pg_namespace nsp ON nsp.oid = typ.typnamespace
+                        WHERE nsp.nspname = current_schema()
+                            AND typ.typname = 'channel_type') THEN
+    CREATE TYPE channel_type AS ENUM ('P', 'G', 'O', 'D');
+  END IF;
+END;
+$$
+LANGUAGE plpgsql;
+
+ALTER TABLE channels alter column type type channel_type using type::channel_type;
+
+DO
+$$
+BEGIN
+  IF NOT EXISTS (SELECT * FROM pg_type typ
+                            INNER JOIN pg_namespace nsp ON nsp.oid = typ.typnamespace
+                        WHERE nsp.nspname = current_schema()
+                            AND typ.typname = 'team_type') THEN
+    CREATE TYPE team_type AS ENUM ('I', 'O');
+  END IF;
+END;
+$$
+LANGUAGE plpgsql;
+
+ALTER TABLE teams alter column type type team_type using type::team_type;
+
+DO
+$$
+BEGIN
+  IF NOT EXISTS (SELECT * FROM pg_type typ
+                            INNER JOIN pg_namespace nsp ON nsp.oid = typ.typnamespace
+                        WHERE nsp.nspname = current_schema()
+                            AND typ.typname = 'upload_session_type') THEN
+    CREATE TYPE upload_session_type AS ENUM ('attachment', 'import');
+  END IF;
+END;
+$$
+LANGUAGE plpgsql;
+
+ALTER TABLE uploadsessions alter column type type upload_session_type using type::upload_session_type;