feat(forms): add isolated Form A consultation testing

www/.env.example

@@ -9,6 +9,9 @@ PUBLIC_AIA_FORMS_MOCK_RESULT=success
 # unavailable in indexing-enabled builds even when both are set.
 PUBLIC_AIA_FORMS_ENVIRONMENT=local
 PUBLIC_AIA_FORMS_ISOLATED_TEST_APPROVED=false
+# Separately authorizes the nine Form A consultation placements in an
+# isolated-test build only. It has no effect on production eligibility.
+PUBLIC_AIA_FORMS_CONSULTATION_TEST_APPROVED=false
 # Form A production additionally requires mode=live, LIVE_APPROVED=true and
 # environment=production. PUBLIC_ALLOW_INDEXING never authorizes a form.
 PUBLIC_AIA_FORM_A_PRODUCTION_APPROVED=false