Use wider type for "reveal in model editor"

[shati-patel]

The model alerts view will have a button that lets you open the method in the model editor (to be added in a follow-up PR):

I want to re-use the existing "reveal in model editor" event (used by the method modeling side bar), but that uses the Method type (instead of ModeledMethod, like in the model alerts view).

Both of those extend the MethodSignature type, so I think it makes sense to use that as a suitable "wider" type to accommodate both. I've tested that the button in the method modeling side bar still works as normal 🧪 🎉

Checklist

N/A, no user visible impact

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.

[koesie10]

LGTM