fix(vm): stop warning once per entity on BETWEEN with an unsupported left-hand type

[junichi-cstk]

What changes

lio's metaforarunner is logging this warning in large volumes:

between not implemented for type map[string]time &expr.TriNode{...}

The warning comes from walkTernary whenever BETWEEN's left-hand value is a type the VM can't range-compare (a map, slice or string). Filters are evaluated once per entity, so a single audience with some_map_field BETWEEN "a" AND "b" logs one line for every profile it scans.

This PR removes the log line. The evaluation result doesn't change.

Left-hand value	Before	After
int / number / time	compared	compared (unchanged)
map, slice, string	(nil, false) + a warning per evaluation	(nil, false), nothing logged

This matches evalBinary, which already returns (nil, false) silently for a map compared with < or >.

Why the filters exist

lio's audience builder (lytics-ui) could save BETWEEN on a whole map[string]time field when no key was picked. That path was fixed in lytics-ui #5133 / #5147. A separate lio change will reject the shape when an audience is saved, and audiences already saved with it still need cleaning up. This PR only removes the log noise.

Checks run

• go test ./...: all packages pass.
• New vm cases (mt BETWEEN …, mt NOT BETWEEN …, urls BETWEEN …) pass both before and after the change. They pin the no-match result so membership can't shift. They don't pin the absence of the log line.
• go test -v ./vm/ -args -vv: between not implemented is printed 3 times before the change and 0 after.
• vm/vm_test.go's msgContext map literal is already not gofmt-clean on master. I left it alone to keep the diff small.

Follow-up in lio

Bump github.com/lytics/qlbridge once this merges.

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