[Test] Re-enable v7RestCompatTest for service account (#80471)

Relates: #80389, #79809

Author: ywangd

x-pack/plugin/build.gradle

@@ -115,7 +115,6 @@ tasks.named("yamlRestTestV7CompatTransform").configure{ task ->
   task.skipTest("ml/categorization_agg/Test categorization aggregation with poor settings", "https://github.com/elastic/elasticsearch/pull/79586")
   task.skipTest("data_stream/50_delete_backing_indices/Delete backing index on data stream", "pending backport of https://github.com/elastic/elasticsearch/pull/79916")
   task.skipTest("data_stream/170_modify_data_stream/Modify a data stream", "pending backport of https://github.com/elastic/elasticsearch/pull/79916")
-  task.skipTest("service_accounts/10_basic/Test service account tokens", "mute till we decide whether to make the changes in 7.16")
 
   task.replaceValueInMatch("_type", "_doc")
   task.addAllowedWarningRegex("\\[types removal\\].*")