Remove 2020 validation from pr.yaml

Author: CDiaz-MS

pipelines/pr.yaml

@@ -1,4 +1,4 @@
-# Build for PR validation via Unity 2018, 2019 and 2020.
+# Build for PR validation via Unity 2018 and 2019
 
 variables:
 - template: config/settings.yml
@@ -55,21 +55,4 @@ jobs:
       buildUWPArm: false
       buildUWPDotNet: false
       UnityVersion: $(Unity2019Version)
-
-- job: Unity2020Validation
-  timeoutInMinutes: 90
-  pool:
-    name: On-Prem Unity
-    demands:
-    - ${{ variables.Unity2020Version }}
-    - COG-UnityCache-WUS2-01
-    - SDK_18362 -equals TRUE
-    - VS2019 -equals TRUE
-  steps:
-  - template: templates/common.yml
-    parameters:
-      buildUWPX86: false
-      buildUWPArm: false
-      buildUWPDotNet: false
-      UnityVersion: $(Unity2020Version)
   - template: templates/end.yml