Address TallyHo Client Requests (Bugs/Enhancements)

[JohnMwashuma]

Fixes #433

Task check list

---

• [x] Update Form to Match the Revised Reconciliation Form
• [x] Add a validation check for duplicate barcodes during the results_forms file upload.
• [x] Fix csv exports by form state on the form list page
• [x] Add Sub Constituency name as a filter option on the Candidate Results report table

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 80.49%. Comparing base (d78fcd9) to head (20fb25c).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #432 +/- ## ========================================== + Coverage 80.40% 80.49% +0.09% ========================================== Files 144 144 Lines 9389 9402 +13 ========================================== + Hits 7549 7568 +19 + Misses 1840 1834 -6 ```

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