feat: remove experimental flag

[ematipico]

Description (required)

This PR removes the queued rendering experimental flag.

For Astro version: 7.0.0. See astro PR #16981.

[astrobot-houston]

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fr/reference/experimental-flags/queued-rendering.mdx	Localization removed, will be marked as missing.
ja/reference/experimental-flags/queued-rendering.mdx	Localization removed, will be marked as missing.
ko/reference/experimental-flags/queued-rendering.mdx	Localization removed, will be marked as missing.

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[ArmandPhilippot]

Thanks, Ema! We probably want something in the upgrade guide too but the section does not exist yet (related to #13944). So, I'll put a TODO on my side as reminder!

[yanthomasdev]

LGTM!