fix(compat): add .render property referencing original render function

[upupming]

Follows #4793, port the .render of forwarded component to preact v10.x

[github-actions]

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[marvinhagemeister]

Thanks!

[rschristian]

Just wanted to say good job on catching this! We merged our v11 mega branch/PR into main around the time of #4793 and must've missed backporting it ourselves, probably wouldn't have noticed now that it's a month+ old.

Thanks again!