bug: vertical sharding doesn't work well with scalar function

[yeya24]

Describe the bug
Runs the PromQLsmith test and got an error for inconsistent results between vertical sharding and non sharding queries.

    query_fuzz_test.go:165: case 10 error mismatch.
        instant query: (
            (
                {job="test"}
              *
                bottomk without (job, __name__) (-(scalar({series="1"}) / time()), asinh(--{series="0"}))
            )
          >=
            max_over_time({__name__="test_series"}[2m])
        )
        err1: <nil>
        err2: execution: Scalar value NaN overflows int64

The query itself looks complex, but the key part is bottomk without (job, __name__) (-(scalar({series="1"}) / time()), xxxxxx). If a topk param is provided via scalar(some_series), if the series is not matched in the shard, then scalar will return NaN causing bottomk to fail. This is very similar to #5203.