[ML] Unmute a couple accidentally muted bwc tests for DF analytics (#53613)

x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/upgraded_cluster/90_ml_data_frame_analytics_crud.yml

@@ -80,9 +80,6 @@
 
 ---
 "Get mixed cluster outlier_detection job":
-  - skip:
-      reason: "Waiting for backport of https://github.com/elastic/elasticsearch/pull/47935"
-      version: all
   - do:
       ml.get_data_frame_analytics:
         id: "mixed_cluster_outlier_detection_job"
@@ -101,9 +98,6 @@
 
 ---
 "Get mixed cluster outlier_detection job stats":
-  - skip:
-      reason: "Waiting for backport of https://github.com/elastic/elasticsearch/pull/47935"
-      version: all
   - do:
       ml.get_data_frame_analytics_stats:
         id: "mixed_cluster_outlier_detection_job"