Show role comments and use feature flags

Comments and contact person had feature flags created for their visibility some time ago, but we missed this section of the frontend. In addition, comments that were set on a role during invitation was not visible later, defeating the purpose. They are now visible if comments are enabled.

Resolves: GREG-197

frontend/src/routes/sponsor/guest/newGuestRole/index.tsx

@@ -25,6 +25,7 @@ import { useTranslation } from 'react-i18next'
 import { Link, useHistory, useParams } from 'react-router-dom'
 import SponsorInfoButtons from 'routes/components/sponsorInfoButtons'
 import { submitJsonOpts } from 'utils'
+import { useFeatureContext } from 'contexts/featureContext'
 
 type AddRoleFormData = {
   orgunit: number
@@ -104,6 +105,7 @@ function NewGuestRole({ guest, reloadGuestInfo }: NewGuestRoleProps) {
     setValue,
     getValues,
   } = useForm<AddRoleFormData>()
+  const { displayContactAtUnit, displayComment } = useFeatureContext()
 
   const { pid } = useParams<GuestInfoParams>()
   const history = useHistory()
@@ -279,20 +281,25 @@ function NewGuestRole({ guest, reloadGuestInfo }: NewGuestRoleProps) {
               />
             )}
           />
-          <TextField
-            id="contact"
-            label={t('input.contactPersonUnit')}
-            multiline
-            rows={5}
-            {...register('contact_person_unit')}
-          />
-          <TextField
-            id="comments"
-            label={t('input.comment')}
-            multiline
-            rows={5}
-            {...register('comments')}
-          />
+          {displayContactAtUnit && (
+            <TextField
+              id="contact"
+              label={t('input.contactPersonUnit')}
+              multiline
+              rows={5}
+              {...register('contact_person_unit')}
+            />
+          )}
+          {displayComment && (
+            <TextField
+              id="comments"
+              label={t('input.comment')}
+              multiline
+              rows={5}
+              {...register('comments')}
+            />
+          )}
+
           <FormControlLabel
             control={
               <Checkbox