Add closed plugin status to plugins.php listing.

[dd32]

Trac ticket: https://core.trac.wordpress.org/ticket/30465

This is partially reliant upon https://core.trac.wordpress.org/ticket/53333 / #1332 as the v1.2 updates API will currently return autoupdate data in a different manner. (This is a merge blocker)

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[github-actions]

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Props dd32.

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[github-actions]

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