chore: fix tests regarding BigQueryJdbcMdc.registerInstance()

Author: keshavdandeva

java-bigquery/google-cloud-bigquery-jdbc/src/test/java/com/google/cloud/bigquery/jdbc/OpenTelemetryJulHandlerTest.java

@@ -69,8 +69,7 @@ public void testPublishToOTel() {
             .put(BigQueryJdbcOpenTelemetry.CONNECTION_ID_BAGGAGE_KEY, "test-uuid")
             .build();
     try (Scope scope = baggage.makeCurrent();
-        BigQueryJdbcMdc.MdcCloseable mdcScope =
-            BigQueryJdbcMdc.registerInstance(mockConnection, "test-uuid")) {
+        BigQueryJdbcMdc.MdcCloseable mdcScope = BigQueryJdbcMdc.registerInstance("test-uuid")) {
       logger.info("Test message");
     }
 
@@ -116,8 +115,7 @@ public void testPublishToGcp() {
             .put(BigQueryJdbcOpenTelemetry.CONNECTION_ID_BAGGAGE_KEY, "gcp-uuid")
             .build();
     try (Scope scope = baggage.makeCurrent();
-        BigQueryJdbcMdc.MdcCloseable mdcScope =
-            BigQueryJdbcMdc.registerInstance(mockConnection, "gcp-uuid")) {
+        BigQueryJdbcMdc.MdcCloseable mdcScope = BigQueryJdbcMdc.registerInstance("gcp-uuid")) {
       logger.info("Test message");
     }