Add a option of `Exclude Test` for `Show call hierarchy`

[chenyukang]

When reading the source code of a project, Show call hierarchy is very useful tool to get the flow of code. But for a project with lots of test code, it's very hard to get the real flow, since we need to click reference one by one to take a look at the code:

I notice we already have the option to exclude test code from references: #16441

Maybe we should also exclude test references when this option is enabled, now we need to add a new option?

[Veykril]

We should make it honor that same flag I think, adding an extra option for all these features doesn't sound too great

[chenyukang]

yeah, honor the current flag will be great. I'm not sure whether this will introduce performance issue since there are more checks compared with reference checks, I notice there are some performance benchmark data in #16441 (comment). But since it's not enabled by default, maybe it is not a big deal.