Auto merge of #24624 - garasubo:fix-keypress-trigger, r=paulrouget

Fix keypress trigger condition

Fix #22346

keypress event should be triggered for keys representing character
values. So, we should trigger this event for enter key.
This event should not trigger for IME inputs.

TODO:
- It seems we don't handle composition events correctly. To implement this keypress condition correctly, we should fix that first. In my current implementation, onkeypress event will be trigger when the user press Enter key to send inputs in IME (onCompotionEnd).
- I don't update any tests, and I couldn't find any tests related to this change in WPT. It might be better to add some tests for it, but I don't know what is the appropriate way.

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