Ensure remote-cluster cluster is available when configuring tasks using it (#78397)

Fixes #78389

Co-authored-by: Elastic Machine <[email protected]>

Author: breskeby

qa/multi-cluster-search/build.gradle

@@ -12,10 +12,13 @@ apply plugin: 'elasticsearch.internal-testclusters'
 apply plugin: 'elasticsearch.standalone-rest-test'
 apply plugin: 'elasticsearch.rest-resources'
 
+
 dependencies {
   testImplementation project(":client:rest-high-level")
 }
 
+testClusters.register('remote-cluster')
+
 tasks.register('remote-cluster', RestIntegTestTask) {
   mustRunAfter("precommit")
   systemProperty 'tests.rest.suite', 'remote_cluster'