Add qa selectors for service desk

app/assets/javascripts/projects/settings_service_desk/components/service_desk_setting.vue

@@ -162,6 +162,7 @@ export default {
         <gl-form-select
           id="service-desk-template-select"
           v-model="selectedTemplate"
+          data-qa-selector="service_desk_template_dropdown"
           :options="templateOptions"
         />
         <label for="service-desk-email-from-name" class="mt-3">
@@ -175,6 +176,7 @@ export default {
           <gl-button
             variant="success"
             class="gl-mt-5"
+            data-qa-selector="save_service_desk_settings_button"
             :disabled="isTemplateSaving"
             @click="onSaveTemplate"
           >

app/views/projects/_service_desk_settings.html.haml

 - expanded = expanded_by_default?
-%section.settings.js-service-desk-setting-wrapper.no-animate#js-service-desk{ class: ('expanded' if expanded) }
+%section.settings.js-service-desk-setting-wrapper.no-animate#js-service-desk{ class: ('expanded' if expanded), data: { qa_selector: 'service_desk_settings_content' } }
   .settings-header
     %h4.settings-title.js-settings-toggle.js-settings-toggle-trigger-only= _('Service Desk')
     %button.btn.gl-button.js-settings-toggle