Remove enable nested queries (#44447)

* update e2e test for command pallete to use a valid setting

* remove the setting from the ui, make it always true, unless set false from env

* remove enable-nested-queries from admin section on fe

- fix unused oldValue -> _oldValue

* tests aren't allowed to change enable-nested-queries

* fix test + disallow setting nested queries from code

* we cannot set enable-nested-queries

- set the env var instead

* add checks for the enable-nested-queries setting

* make resolve-source-cards work with enable-nested-queries setting

* fix recents uri interception

* return enable_nested_queries setting to client

* adjust fetchmock url matcher

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Co-authored-by: Nick Fitzpatrick <nickfitz.582@gmail.com>