Revert "test: fix testSendRequestWithNullRequestId to assert null requestId"

This reverts commit 8c292d2.

Author: Devesh-Skyflow

src/test/java/com/skyflow/utils/HttpUtilityTests.java

@@ -167,7 +167,7 @@ public void testSendRequestWithNullRequestId() {
             params.addProperty("key", "value");
             String response = httpUtility.sendRequest("GET", url, params, headers);
             Assert.assertEquals(expected, response);
-            Assert.assertNull(HttpUtility.getRequestID());
+            Assert.assertNotNull(HttpUtility.getRequestID());
         } catch (Exception e) {
             fail(INVALID_EXCEPTION_THROWN);
         }