Tests: Bring some consistency to `links_add_base_url()` and `links_ad… #35548

Job	Run time
Check PHP compatibility / Run compatibility checks	21s
Slack Notifications / Prepare notifications	4s
Slack Notifications / Failure notifications	0s
Slack Notifications / Fixed notifications	0s
Slack Notifications / Success notifications	4s
Slack Notifications / Cancelled notifications	0s
Failed workflow tasks	0s
	29s

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