[MLv2] Handle coalesce type after conversion (#33814)

* [MLv2] Handle coalesce type after conversion

* Update test/metabase/lib/aggregation_test.cljc

Co-authored-by: metamben <103100869+metamben@users.noreply.github.com>

* Only update fields on converted queries

* Don't convert if base-type exists

* Guard against non-numeric field ids

* Fix test with hardcoded ids

* Allow metadata/field to return nil on not found

* Add ipaddress and mongobsonid types to equality-comparable-types

* Support is-empty not-empty for mongobsonid

* Add base-type to FE tests

* Fix e2e tests - column metadata is valid with field types filled in

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Co-authored-by: metamben <103100869+metamben@users.noreply.github.com>