Svelte: Fix generated properties on Svelte event handler

[j3rem1e]

Closes #24019

What I did

The fix is explained in the referenced issue.

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[j3rem1e]

I don't think anymore it's a good idea to remove the action here. It's used in the auto-registration of actions un PreviewRenderer.svelte.

I suppose we should try to hide argsType with category 'event' in the source generator. I will rework this PR.

[yannbf]

Hey @j3rem1e thank you so much for your contribution <3
@JReinhold could you please take a look? Thanks!

[kasperpeulen]

Thanks, LGTM!