[Cypress Helpers] Extract functions into separate files (#16884)

* Extract e2e setup helpers

* Extract e2e ui elements helpers

* Extract e2e dashboard helpers

* Extract e2e open table helpers

* Extract e2e database metadata helpers

* Extract e2e qa databases helpers

* Extract e2e ad-hoc question helpers

* Extract e2e enterprise helpers

* Extract e2e mock app settings helpers

* Extract e2e assertion helpers

* Extract e2e data model helpers

* Extract e2e misc helpers

* Extract e2e deprecated helpers

* Remove `getIframeBody` from global helper functions

* Remove `generateUsers` from global helper functions

* Remove `enableSharingQuestion` from global helper functions

* Remove unused functions