Fix dismissal reason modal based on FF

ee/app/assets/javascripts/security_dashboard/components/pipeline/vulnerability_dismissal_reason.vue

@@ -59,6 +59,7 @@ export default {
     </template>
     <gl-collapsible-listbox
       id="dismissal-reason"
+      data-testid="dismissal-reason"
       :items="$options.items"
       :selected="value"
       :toggle-text="toggleText"

ee/app/assets/javascripts/security_dashboard/components/pipeline/vulnerability_finding_modal.vue

@@ -594,6 +594,7 @@ export default {
             <gl-form-textarea
               id="dismissal-comment"
               v-model="dismissalComment"
+              data-testid="dismissal-comment"
               :placeholder="$options.i18n.dismissCommentPlaceholder"
               @keydown.meta.enter="updateDismissal"
               @keydown.esc.stop.prevent="handleCommentEsc"

qa/qa/ee/page/merge_request/show.rb

@@ -49,6 +49,13 @@ def self.prepended(base)
 
               view 'ee/app/assets/javascripts/security_dashboard/components/pipeline/vulnerability_finding_modal.vue' do
                 element 'vulnerability-modal-content'
+                element 'dismiss-button'
+                element 'save-editing-dismissal'
+                element 'dismissal-comment'
+              end
+
+              view 'ee/app/assets/javascripts/security_dashboard/components/pipeline/vulnerability_dismissal_reason.vue' do
+                element 'dismissal-reason'
               end
 
               view 'ee/app/assets/javascripts/vue_shared/security_reports/components/modal.vue' do
@@ -142,15 +149,31 @@ def dismiss_vulnerability_with_reason(name, reason)
           end
 
           def add_comment_and_dismiss(comment)
-            click_element :dismiss_with_comment_button
-            find_element(:dismiss_comment_field).fill_in with: comment, fill_options: { automatic_label_click: true }
-            click_element :add_and_dismiss_button
+            if has_element?(:dismiss_with_comment_button)
+              click_element :dismiss_with_comment_button
+              find_element(:dismiss_comment_field).fill_in with: comment, fill_options: { automatic_label_click: true }
+              click_element :add_and_dismiss_button
+            else
+              click_element('dismiss-button')
+              find(dismissal_reason_selector, wait: 5).click
+              find(dismissal_reason_item_selector("not_applicable")).click
+              find_element('dismissal-comment').fill_in with: comment, fill_options: { automatic_label_click: true }
+              click_element('save-editing-dismissal')
+            end
 
             wait_until(reload: false) do
               has_no_element?('vulnerability-modal-content')
             end
           end
 
+          def dismissal_reason_selector
+            "[data-testid='dismissal-reason'] > button"
+          end
+
+          def dismissal_reason_item_selector(reason)
+            "[data-testid='listbox-item-#{reason}']"
+          end
+
           def resolve_vulnerability_with_mr(name)
             expand_vulnerability_report
             click_vulnerability(name)