Administration: Switch core post type labels to `add_new_item`. #35543

Job	Run time
Check PHP compatibility / Run compatibility checks	20s
Slack Notifications / Prepare notifications	3s
Slack Notifications / Success notifications	3s
Slack Notifications / Fixed notifications	0s
Slack Notifications / Failure notifications	0s
Slack Notifications / Cancelled notifications	0s
Failed workflow tasks	0s
	26s

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