Respect chart orders in static viz (#26797)

* Refactor so static combo chart is ready for reordering

* Correct test names

* Clean up static viz combo chart BE API

* sort static combo chart

* Order static funnel chart

* Remove unused import and function

* Fix BE tests

* Remove custom column name tests since logic is moved to FE

* Remove graph.series_order when changing dimensions (#26842)

* review

Co-authored-by: Nick Fitzpatrick <nick@metabase.com>
Co-authored-by: Aleksandr Lesnenko <alxnddr@gmail.com>