This makes the two interpolation errors consistent and avoids checking the same thing per link
(which previously would log the same error per link).
The test changes are not necessary but do make them stricter and more like the selmulti error tests.
Closes#13267
BREAKING CHANGE:
Using interpolation in any on* event attributes (e.g. `<button onclick="{{myVar}}">`) will now throw
the "nodomevents" error at compile time.
Previously the nodomevents was thrown at link time. The new behavior makes it consistent with
the "selmulti" error.
The breaking change should be rare, as it relates to incorrect API use that should not make it to
production apps in the first place.
Jason Bedard
b89c2181a9