Optimize DB calls of dashboard card updates some more (#29132)

* Optimize average case DB calls

* Typo

* Fix test

* Remove duplicate require

* Return nil

* Fixes

* Fix docstring

* Remove unused require

* Avoid hydrating ordered_cards on the dashboard again

* Tidy

* Update docstring

* Move transaction

* Move comment

* Remove dashboard->param-field-ids

* whitespace

* Tidy update-dashcards!

* Updates from suggestions

* Update test

* Update test description

Co-authored-by: Ngoc Khuat <qn.khuat@gmail.com>

---------

Co-authored-by: Ngoc Khuat <qn.khuat@gmail.com>