Update lists.go runtime cost calculator

[TristonianJones]

Updates to address cost calculation failures on invalid arguments

[TristonianJones]

@pohly if you'd like to patch this change and give it a try on k8s

[pohly]

I can confirm that this fixes:

=== RUN   TestValidationExpressions/ext_lists_version_3/[[1],[2],[3,4]].flatten(-1)_==_[1,2,3,4]
    validation_test.go:2256: expected error to contain 'level must be non-negative evaluating rule: [[1],[2],[3,4]].flatten(-1) == [1,2,3,4]', but got: root: Invalid value: "object": validation failed due to running out of cost budget, no further validation rules will be run
--- FAIL: TestValidationExpressions/ext_lists_version_3/[[1],[2],[3,4]].flatten(-1)_==_[1,2,3,4] (0.01s)

from https://prow.k8s.io/view/gs/kubernetes-ci-logs/pr-logs/pull/140205/pull-kubernetes-unit/2073031908379332608