HTML API: Use case insensitive tag_name comparison in `::next_tag`. #19273

Job	Run time
Performance tests / Run tests	10m 42s
Performance tests (with memcached) / Run tests	10m 16s
Slack Notifications / Prepare notifications	6s
Slack Notifications / Success notifications	2s
Slack Notifications / Failure notifications	0s
Slack Notifications / Cancelled notifications	0s
Slack Notifications / Fixed notifications	0s
Failed workflow tasks	0s
	21m 6s

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