* feat: 2207 - sales forecast (#2211)

* initial commit

* small change

* sales forecast backend

* feat: 2204 and 2209 - sales forecast (#2218)

* feat: 2204 and 2209 = sales forecast

* some changes

* wording changes

* some changes

* oct 1 stuff - spreadsheet column name changes (#2225)

* address codeQL-raised issue

* Task: Frontend Spreadsheet Record Validation #2220 (#2228)

* Frontend validation for SalesForecastRecord records.

* Fixing casing

* Cleanup

* feat: 2219 - forecast report column mapping + automatic summation of ZEVs supplied (#2231)

* feat: 2219 - forecast report colum mapping + automatic summation of ZEVs supplied

* small change

* fix totals display upon discard of records

* feat: 2221 - some styling (#2236)

* Task: Sales Forecast Report Checkbox Assertion #2222 (#2232)

* Adding new signing authority assertion for Sales Forecast

* Cleaning up

* wording changes

* formatting

* fix: amend download() function to take into account case where content-disposition is not an exposed header

* update template

* spreadsheet validation updates

* spreadsheet validation cleanup

* Added message for a successful or unsuccessful upload (#2278)

Co-authored-by: julianforeman <[email protected]>

* cleanup

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Co-authored-by: JulianForeman <[email protected]>
Co-authored-by: julianforeman <[email protected]>

* fix: adds context to update comment

* chore: removes extra spaces