Re-add IDBDatabase abort event

[caugner]

Based on #15006.

Summary

Adds the abort event on IDBDatabase.

Motivation

The IDBDatabase abort event is defined in the spec, and implemented in Chrome, Firefox, and Safari, so the data shouldn't
have been removed in the first place.

Important

While the same may apply to 50+ events that can bubble to Element, Document, and Window, we do not intend to add corresponding data to those three interfaces.

Test results and supporting details

The data was originally removed in #15006.

Related issues

Fixes: #15345

[github-actions]

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[ddbeck]

Since this is the PR that's going to appear in the commit history, can you add some text to the PR description summarizing that we're doing something exceptional here, why, and that we're not planning to extend this to other PRs? I'd like some kind of paper trail that doesn't require reading the entirety of at least one issue (and probably more).

[caugner]

can you add some text to the PR description summarizing that we're doing something exceptional here, why, and that we're not planning to extend this to other PRs?

@ddbeck Can you elaborate the "something exceptional" bit? I have added a Motivation section in the PR now:

The IDBDatabase event is defined in the spec, and implemented in Chrome, Firefox, and Safari, so the data shouldn't have been removed in the first place.

(Edit) I have now also added the following notecard:

Important

While the same may apply to 50+ events that can bubble to Element, Document, and Window, we do not intend to add corresponding data to those three interfaces.