fix: upgrade force logic parity with deploy force logic

coop-cloud/organising#444 (comment)

cli/app/upgrade.go

@@ -145,6 +145,11 @@ recipes.
 			}
 		}
 
+		if internal.Force && chosenUpgrade == "" {
+			logrus.Warnf("%s is already upgraded to latest but continuing (--force/--chaos)", app.Name)
+			chosenUpgrade = deployedVersion
+		}
+
 		// if release notes written after git tag published, read them before we
 		// check out the tag and then they'll appear to be missing. this covers
 		// when we obviously will forget to write release notes before publishing