Editorial: Update use of WebIDL "invoke a callback function"

[jeremyroman]

Part of whatwg/webidl#1425.

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[jeremyroman]

@shaseley ptal?

In principle I think the callback type could be changed to return Promise<any>, because that causes WebIDL to automatically wrap non-promises and thrown exceptions, in which case the explicit handling here could be omitted entirely.

But that is fairly minor and might be annoying to propagate to browser vendors, could in theory have slight visible effects because the [[Resolve]] steps would run twice, etc., so I've used "rethrow" instead and continued to explicitly catch the exception here.

/cc @domenic

[shaseley]

LGTM, thanks. You might need to rebase to get past the build error. There was a stale reference that somehow wasn't previously caught, which I've fixed on main. But rerunning all jobs on this didn't fix it.

[jeremyroman]

Rebased; I don't have permissions to either re-run the workflow or merge.