Fix Json output tests in DesignMode

Author: Yaytay

query-engine-design-mode/src/test/java/uk/co/spudsoft/query/main/MainQueryIT.java

@@ -148,7 +148,7 @@ public void testQuery() throws Exception {
             .statusCode(200)
             .extract().body().asString();
 
-    assertThat(body, startsWith("[{\"dataId\":1,\"instant\":\"1971-05-07T03:00\",\"ref\":\"antiquewhite\",\"value\":\"first\",\"children\":\"one\",\"DateField\":\"2023-05-05\",\"TimeField\":null,\"DateTimeField\":null,\"LongField\":null,\"DoubleField\":null,\"BoolField\":null,\"TextField\":null}"));
+    assertThat(body, startsWith("[{\"dataId\":1,\"instant\":\"1971-05-07T03:00:00Z\",\"ref\":\"antiquewhite\",\"value\":\"first\",\"children\":\"one\",\"DateField\":\"2023-05-05\",\"TimeField\":null,\"DateTimeField\":null,\"LongField\":null,\"DoubleField\":null,\"BoolField\":null,\"TextField\":null},"));
 
     body = given()
             .queryParam("key", mysql.getName())
@@ -161,7 +161,7 @@ public void testQuery() throws Exception {
             .extract().body().asString();
 
     // Note that MySQL doesn't do booleans
-    assertThat(body, startsWith("[{\"dataId\":1,\"instant\":\"1971-05-07T03:00\",\"ref\":\"antiquewhite\",\"value\":\"first\",\"children\":\"one\",\"DateField\":\"2023-05-05\",\"TimeField\":null,\"DateTimeField\":null,\"LongField\":null,\"DoubleField\":null,\"BoolField\":null,\"TextField\":null},"));
+    assertThat(body, startsWith("[{\"dataId\":1,\"instant\":\"1971-05-07T03:00:00Z\",\"ref\":\"antiquewhite\",\"value\":\"first\",\"children\":\"one\",\"DateField\":\"2023-05-05\",\"TimeField\":null,\"DateTimeField\":null,\"LongField\":null,\"DoubleField\":null,\"BoolField\":null,\"TextField\":null},{\"dataId\":2,\"instant\":\"1971-05-08T06:00:00Z\",\"ref\":\"aqua\",\"value\":\"second\",\"children\":\"two,four\",\"DateField\":\"2023-05-04\",\"TimeField\":\"23:58\",\"DateTimeField\":null,\"LongField\":null,\"DoubleField\":null,\"BoolField\":null,\"TextField\":null},"));
 
     byte[] bodyBytes = given()
             .queryParam("key", postgres.getName())