e2e: add open-graph image tests

[sommeeeer]

This PR will add e2e testing for next/og and opengraph-image.tsx in the app router

• An empty page on the route /og that should have an opengraph image present in the metatags.
• An API route on /api/og that returns an ImageResponse from next/og.

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[sommeeeer]

Perhaps we should consider adding another test for checking when something custom is passed to options in ImageResponse it will be used in the HTTP response?

docs: ImageResponse

[conico974]

LGTM Thanks