Add nullability annotations to tests in smoke-test/spring-boot-smoke-test-amqp

See gh-47263

smoke-test/spring-boot-smoke-test-amqp/build.gradle

@@ -30,4 +30,12 @@ dependencies {
 	dockerTestImplementation("org.awaitility:awaitility")
 	dockerTestImplementation("org.testcontainers:junit-jupiter")
 	dockerTestImplementation("org.testcontainers:rabbitmq")
-}
+}
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}
+
+tasks.named("compileDockerTestJava") {
+	options.nullability.checking = "tests"
+}