Replace go-migrate with morph (#19116)

db/migrations/postgres/000004_create_command_webhooks.up.sql

@@ -0,0 +1,12 @@
+CREATE TABLE IF NOT EXISTS commandwebhooks (
+    id VARCHAR(26) PRIMARY KEY,
+    createat bigint,
+    commandid VARCHAR(26),
+    userid VARCHAR(26),
+    channelid VARCHAR(26),
+    rootid VARCHAR(26),
+    parentid VARCHAR(26),
+    usecount integer
+);
+
+CREATE INDEX IF NOT EXISTS idx_command_webhook_create_at ON commandwebhooks (createat);