Auto merge of #25488 - pshaughn:clickactivate, r=jdm

Event dispatch rewritten to align to spec, activate on clicks better

I went over the changes to the event dispatch spec that had accumulated over the past few years, rewriting dispatch/invoke/inner-invoke almost completely and modifying other code where it was relevant. Most of the remaining obvious deviations from spec are things that will only come up when we start handling events in shadow DOM.

I am pushing now because I want to see CI test results, but please do not approve this PR just if automated test improvements look good. I may have broken some actual UI interactions in the course of fixing synthetic events, and some manual testing is needed, including checking that manual interactions with interactive content continue to fire the events they're supposed to.

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #25384 and fix #22783 and fix #25199

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- [ ] There are automated tests for the synthetic-click parts of these changes, BUT the effects on real UI events need some manual testing before merging

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