add created timestamp to tokens table (#10573)

migrations/1727809177709_add-created.cjs

+exports.shorthands = undefined
+
+exports.up = pgm => {
+  pgm.addColumn('github_user_tokens', {
+    created: {
+      type: 'TIMESTAMP',
+      notNull: true,
+      default: pgm.func('CURRENT_TIMESTAMP'),
+    },
+  })
+}
+
+exports.down = pgm => {
+  pgm.dropColumn('github_user_tokens', 'created')
+}