Turn off PRBatching for version override matrices (Azure#44493)

* Turn off PRBatching for version override matrices

* Remove serialization changes, the version override tests were removed in main

Author: JimSuplizio

sdk/core/ci.yml

@@ -194,6 +194,7 @@ extends:
       - Name: version_overrides_tests
         Path: sdk/core/version-overrides-matrix.json
         Selection: all
+        PRBatching: false
         GenerateVMJobs: true
 
     LiveTestStages: