Fix 3rd pary S3 tests (#40588)

* Fix 3rd pary S3 tests

This is allready excluded on line 186, by doing this again here, the
other exclusion from arround that line are removed causing the tests to
fail.

* Fix blacklisting with the fixture

plugins/repository-s3/build.gradle

@@ -177,6 +177,10 @@ if (useFixture) {
     }
     plugin file(tasks.bundlePlugin.archiveFile)
   }
+
+  integTest.runner {
+    systemProperty 'tests.rest.blacklist', 'repository_s3/50_repository_ecs_credentials/*'
+  }
 } else {
   integTest.runner {
     systemProperty 'tests.rest.blacklist',
@@ -259,10 +263,6 @@ testClusters.integTest {
   }
 }
 
-integTest.runner {
-  systemProperty 'tests.rest.blacklist', 'repository_s3/50_repository_ecs_credentials/*'
-}
-
 if (useFixture) {
   task integTestECS(type: RestIntegTestTask.class) {
     description = "Runs tests using the ECS repository."