Revert "[ML-DataFrame] Muting tests for backport (elastic#44749)"

This reverts commit 6818a62.

Author: droberts195

x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/mixed_cluster/80_data_frame_jobs_crud.yml

@@ -1,8 +1,5 @@
 ---
 "Test put batch data frame transforms on mixed cluster":
-  - skip:
-      version: "7.4.0 - "
-      reason: waiting backport of https://github.com/elastic/elasticsearch/pull/44350
   - do:
       cluster.health:
         index: "dataframe-transform-airline-data"
@@ -121,9 +118,6 @@
 
 ---
 "Test put continuous data frame transform on mixed cluster":
-  - skip:
-      version: "7.4.0 - "
-      reason: waiting backport of https://github.com/elastic/elasticsearch/pull/44350
   - do:
       cluster.health:
         index: "dataframe-transform-airline-data-cont"
@@ -192,9 +186,6 @@
 
 ---
 "Test GET, start, and stop old cluster batch transforms":
-  - skip:
-      version: "7.4.0 - "
-      reason: waiting backport of https://github.com/elastic/elasticsearch/pull/44350
   - do:
       cluster.health:
         index: "dataframe-transform-airline-data"
@@ -284,9 +275,6 @@
 
 ---
 "Test GET, stop, start, old continuous transforms":
-  - skip:
-      version: "7.4.0 - "
-      reason: waiting backport of https://github.com/elastic/elasticsearch/pull/44350
   - do:
       cluster.health:
         index: "dataframe-transform-airline-data-cont"

x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/old_cluster/80_data_frame_jobs_crud.yml

@@ -1,8 +1,5 @@
 ---
 "Test put batch data frame transforms on old cluster":
-  - skip:
-      version: "7.4.0 - "
-      reason: waiting backport of https://github.com/elastic/elasticsearch/pull/44350
   - do:
       indices.create:
         index: dataframe-transform-airline-data
@@ -139,9 +136,6 @@
 
 ---
 "Test put continuous data frame transform on old cluster":
-  - skip:
-      version: "7.4.0 - "
-      reason: waiting backport of https://github.com/elastic/elasticsearch/pull/44350
   - do:
       indices.create:
         index: dataframe-transform-airline-data-cont

x-pack/qa/rolling-upgrade/src/test/resources/rest-api-spec/test/upgraded_cluster/80_data_frame_jobs_crud.yml

@@ -7,9 +7,6 @@ setup:
         timeout: 70s
 ---
 "Get start, stop, and delete old and mixed cluster batch data frame transforms":
-  - skip:
-      version: "7.4.0 - "
-      reason: waiting backport of https://github.com/elastic/elasticsearch/pull/44350
   # Simple and complex OLD transforms
   - do:
       data_frame.get_data_frame_transform:
@@ -165,9 +162,6 @@ setup:
 
 ---
 "Test GET, stop, delete, old and mixed continuous transforms":
-  - skip:
-      version: "7.4.0 - "
-      reason: waiting backport of https://github.com/elastic/elasticsearch/pull/44350
   - do:
       data_frame.get_data_frame_transform:
         transform_id: "old-simple-continuous-transform"