Port query description logic to MLv2 (#29200)

* Query  D E S C R I P T I O N S

* WIP

* MLv2 Query description

* Test fixes

* More robust error handling

* MLv2 more shuffling things around

* Remove unneeded impl

* Cumulative FE changes

* WIP

* lib.expressions -> lib.expression

* Address PR feedback

* Fix everything

* Oops fix missing metadata

* Test fixes 

* Fixes post-merge

* Fix merge conflict

* JS metadata overhaul

* Test fix 

* Test fix

* Hack to workaround busted JOINs

* Use Braden's better fix

* Cumulative fixes

* Test fixes 

* Remove unused

* Include temporal unit in query description

* Don't change indentation

* Revert e2e browser changes

* Revert bin change

* Meaningless change to kick CI