Automatically add 'untriaged' label to new issues without milestones (#6060)

Author: jeffhandley

.github/policies/resourceManagement.yml

@@ -214,8 +214,6 @@ configuration:
         - isAction:
             action: Closed
       then:
-      - removeLabel:
-          label: untriaged
       - removeLabel:
           label: 'work in progress :construction:'
       - removeLabel:

.github/policies/untriaged.yml

@@ -0,0 +1,36 @@
+id: untriaged
+name: Automatically apply and remove the untriaged label
+resource: repository
+disabled: false
+where:
+configuration:
+  resourceManagementConfiguration:
+    eventResponderTasks:
+    - description: Add untriaged label to new/reopened issues without a milestone
+      if:
+      - payloadType: Issues
+      - or:
+        - isAction:
+            action: Opened
+        - isAction:
+            action: Reopened
+      - isOpen
+      - not: isPartOfAnyMilestone
+      - not:
+          hasLabel:
+            label: untriaged
+      then:
+      - addLabel:
+          label: untriaged
+
+    - description: Remove untriaged label from closed issues
+      if:
+      - payloadType: Issues
+      - hasLabel:
+          label: untriaged
+      - or:
+        - isAction:
+            action: Closed
+      then:
+      - removeLabel:
+          label: untriaged