Disable packaging tests for arm ironbank docker image (#90478)

We've removed the ARM IronBank docker project (since we don't produce
such an image). This pull request also ensures we don't attempt to run
packaging tests against this missing distribution.

Closes #90449

Author: mark-vieira

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/test/DistroTestPlugin.java

@@ -393,6 +393,10 @@ private List<ElasticsearchDistribution> configureDistributions(Project project)
                             continue;
                         }
                     }
+                    if (type == DOCKER_IRONBANK && architecture == Architecture.AARCH64) {
+                        // We don't produce an ARM IronBank Image
+                        continue;
+                    }
                     currentDistros.add(
                         createDistro(distributions, architecture, type, null, bundledJdk, VersionProperties.getElasticsearch())
                     );