ENT-2105: Remove unnecessary sourceSets from integration tests. (#1029)

The database scripts are already available from the test-utils JAR via the classpath and so don't need
to be included as additional source sets.

samples/trader-demo/build.gradle

@@ -24,9 +24,6 @@ sourceSets {
             runtimeClasspath += main.output + test.output
             srcDir file('src/integration-test/kotlin')
         }
-        resources {
-            srcDir file('../testing/test-utils/src/main/resources')
-        }
     }
 }