Update dropdown in the product submission 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.

Co-authored-by: dav3r <david.redmin@trio.dhs.gov>
Co-authored-by: Shane Frasier <jeremy.frasier@trio.dhs.gov>

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

@@ -51,11 +51,11 @@ 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
     validations:
       required: true
   - type: input