Call hierarchy: allow to remove nodes

[bpasero]

Similar to "Find References", allow me to remove individual nodes from the call graph, e.g. to exclude references that I reviewed (or from tests).

[babakks]

I'd like to work on this.

Is there any note/tip that I'd be better aware of?

[mitchell-frost]

I am new here. Can I work on this?

[jrieken]

@babakks was first

The sources are in a separate extension here: https://github.com/microsoft/vscode-references-view/blob/846367409ec890e3415c919db772c3fbfe01f41e/src/extension.ts#L356

There is already a command that can remove references (from find references, find implementations etc) and that must be extended to also support the call hierarchy model

[babakks]

@jrieken I've made the PR.

[jrieken]

Done. Thanks @babakks