Update E2E tests to only run upgrades on supported versions (#1785)

Update E2E tests to only run upgrades on supported versions. Versions
lower than 5.0 will soon no longer work since they rely on direct access
to our storage account (not through AFD)

Author: aholstrup1

.github/workflows/E2E.yaml

@@ -35,7 +35,7 @@ on:
         default: 'preview'
 
 env:
-  TestUpgradesFromVersion: 'v3.1'
+  TestUpgradesFromVersion: 'v5.0'
 
 defaults:
   run: