Fix time-interval against expressions (#38488)

* Fix time-interval against expressions

When simplifying time-interval filters, we forgot to place a
temporal-unit on expressions, which meant that the date-trunc used by
quarters had to match the date exactly rather than being in the interval
range.

* Update optimize temporal filters for expressions

There is a dependency with this middleware and mongo. Without
optimization mongo cannot compare the bucketed timestamps because
AFAICT mongo 4 doesn't have date truncation so we do so in clojure for
the compared literal but cannot do the lhs field/expression.