FSPT-208: script to make nested JSON date strings consistent

For a ~2 week period application `date_submitted` properties were
incorrectly set with timezone information (in this case consistently UTC
with `+00.00`).

The consumer of these dates (the assess tool) has been updated in places
to parse any valid ISO format but leaving different formats of dates
could lead to unpredictiable behaviour.

Update existing assessment records to make this consistent.

assessment_store/scripts/data_updates/FSPT-208-fix-inconsistent-date-strings.sql

@@ -0,0 +1,15 @@
+begin;
+
+/* Check the result is {some} */
+select count(*) from assessment_records where jsonb_blob->>'date_submitted' like '%+00.00';
+
+/* Check we've updated {some} */
+update assessment_records
+set jsonb_blob['date_submitted'] = to_jsonb(replace(jsonb_blob->>'date_submitted', '+00.00', ''))
+where jsonb_blob->>'date_submitted' like '%+00.00';
+
+/* Check the result is 0 */
+select count(*) from assessment_records where jsonb_blob->>'date_submitted' like '%+00.00';
+
+/* Only commit if everything lined up as expected */
+commit;