fix(pr): Unlimited for am2_business

Author: leedongwei

tests/js/getsentry-test/fixtures/am2Plans.ts

@@ -5045,7 +5045,7 @@ const AM2_PLANS: Record<string, Plan> = {
     },
     availableReservedBudgetTypes: AM2_AVAILABLE_RESERVED_BUDGET_TYPES,
     dashboardLimit: -1,
-    metricDetectorLimit: 20,
+    metricDetectorLimit: -1,
   },
 };