Update dropdown in the product update form

Update the product update dropdown's label and options. Mainly focused
on removing usage of Yes/No because these are boolean values in YAML
and thus needed special handling compared to other strings. This mirrors
changes done to the product submission form.

.github/ISSUE_TEMPLATE/product-update-form.yml

@@ -54,11 +54,11 @@ body:
   - type: dropdown
     id: product-updated
     attributes:
-      label: Product update available
+      label: Product update
       description: Is there an update available for the product?
       options:
-        - "Yes"
-        - "No"
+        - Available
+        - Not Available
   - type: input
     id: product-update-link
     attributes: