[Invokers] Only dispatch invoke for built-ins or actions containing '-'

(This relands
https://chromium-review.googlesource.com/c/chromium/src/+/5366502 after
fixing timeout issues in
https://chromium-review.googlesource.com/c/chromium/src/+/5372478)

This change refactors the `HandleInvokeInternal` calls to use an enum
class of known attribute values including a `kCustom` key which can determine if the invoke action meets the criteria for being
a "custom" action - that is it includes a dash (see
https://github.com/whatwg/html/pull/9841/commits/b40ba866cc21553f63d8f6244becbdbc38176310).

This also updates the tests to reflect this; only actions with a `-`, or
otherwise known actions, will dispatch an event. All other actions do
not, and must be manually dispatched. This does not preclude web authors
from manually dispatching said events.

Bug: 40947660
Change-Id: Ie6efeac7991c449b54d0c8b7ed360501ae5c8d37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5388656
Reviewed-by: Joey Arhar <jarhar@chromium.org>
Reviewed-by: Mason Freed <masonf@chromium.org>
Auto-Submit: Keith Cirkel <chromium@keithcirkel.co.uk>
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1277851}