⚰️ [#76] Delete more dead code

More dead code that relied on Formio utils which caused our
bundles to be larger than necessary. The backend has been
updated a long time ago to provide the summary data to
display, rather than having to do this client-side.

The benefit is that no longer load anything from formio
outside of the formio-init chunk, which should result
in better perceived performance for end users.

src/components/Summary/CosignSummary.jsx

@@ -11,7 +11,7 @@ import useSessionTimeout from 'hooks/useSessionTimeout';
 import Types from 'types';
 
 import GenericSummary from './GenericSummary';
-import {loadSummaryData} from './utils';
+import {loadSummaryData} from './data';
 
 const CosignSummary = ({
   form,

src/components/Summary/SubmissionSummary.jsx

@@ -13,7 +13,7 @@ import useRefreshSubmission from 'hooks/useRefreshSubmission';
 import useTitle from 'hooks/useTitle';
 
 import GenericSummary from './GenericSummary';
-import {loadSummaryData} from './utils';
+import {loadSummaryData} from './data';
 
 const completeSubmission = async (submission, statementValues) => {
   const response = await post(`${submission.url}/_complete`, statementValues);

src/components/Summary/data.jsx

@@ -0,0 +1,7 @@
+import {get} from 'api';
+
+const loadSummaryData = async submissionUrl => {
+  return await get(`${submissionUrl.href}/summary`);
+};
+
+export {loadSummaryData};