test: Ignore ITPaginationTest (#13778)

We are constantly running into quota issues with ITPaginationTest. Since
we already have an
[ITPagination](https://github.com/googleapis/google-cloud-java/blob/main/java-showcase/gapic-showcase/src/test/java/com/google/showcase/v1beta1/it/ITPagination.java)
in showcase, this test in Compute does not provide much value, ignore it
to reduce flakiness.

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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: blakeli0

java-compute/google-cloud-compute/src/test/java/com/google/cloud/compute/v1/integration/ITPaginationTest.java

@@ -30,8 +30,10 @@
 import org.junit.AfterClass;
 import org.junit.Assert;
 import org.junit.BeforeClass;
+import org.junit.Ignore;
 import org.junit.Test;
 
+@Ignore("Disabled due to frequent quota issues; covered by showcase ITPagination")
 public class ITPaginationTest extends BaseTest {
   private static ZonesClient zonesClient;