add a test for old and new metrics incubator api (#11084)

Author: zeitlinger

instrumentation/opentelemetry-api/opentelemetry-api-1.37/javaagent/build.gradle.kts

@@ -30,6 +30,12 @@ testing {
         implementation("io.opentelemetry:opentelemetry-api-incubator:1.37.0-alpha")
       }
     }
+    val oldAndNewIncubatorTest by registering(JvmTestSuite::class) {
+      dependencies {
+        implementation("io.opentelemetry:opentelemetry-api-incubator:1.37.0-alpha")
+        implementation("io.opentelemetry:opentelemetry-extension-incubator:1.32.0-alpha")
+      }
+    }
   }
 }