It appears to me that they are still in the game:
Alliance:~
https://www.wowhead.com/wotlk/quest=4182/dragonkin-menace
https://www.wowhead.com/wotlk/quest=4183/the-true-masters
https://www.wowhead.com/wotlk/quest=4184/the-true-masters
https://www.wowhead.com/wotlk/quest=4185/the-true-masters
https://www.wowhead.com/wotlk/quest=4186/the-true-masters
https://www.wowhead.com/wotlk/quest=4223/the-true-masters
https://www.wowhead.com/wotlk/quest=4224/the-true-masters
https://www.wowhead.com/wotlk/quest=4241/marshal-windsor
https://www.wowhead.com/wotlk/quest=4242/abandoned-hope
https://www.wowhead.com/wotlk/quest=4264/a-crumpled-up-note
https://www.wowhead.com/wotlk/quest=4282/a-shred-of-hope
https://www.wowhead.com/wotlk/quest=4322/jail-break
https://www.wowhead.com/wotlk/quest=6402/stormwind-rendezvous
https://www.wowhead.com/wotlk/quest=6403/the-great-masquerade
https://www.wowhead.com/wotlk/quest=6501/the-dragons-eye
https://www.wowhead.com/wotlk/quest=6502/drakefire-amulet
Horde:~
https://www.wowhead.com/wotlk/quest=4903/warlords-command
https://www.wowhead.com/wotlk/quest=4941/eitriggs-wisdom
https://www.wowhead.com/wotlk/quest=4974/for-the-horde
https://www.wowhead.com/wotlk/quest=6566/what-the-wind-carries
https://www.wowhead.com/wotlk/quest=6567/the-champion-of-the-horde
https://www.wowhead.com/wotlk/quest=6568/mistress-of-deception
https://www.wowhead.com/wotlk/quest=6569/oculus-illusions
https://www.wowhead.com/wotlk/quest=6570/emberstrife
https://www.wowhead.com/wotlk/quest=6584/the-test-of-skulls-chronalis
https://www.wowhead.com/wotlk/quest=6582/the-test-of-skulls-scryer
https://www.wowhead.com/wotlk/quest=6583/the-test-of-skulls-somnus
https://www.wowhead.com/wotlk/quest=6585/the-test-of-skulls-axtroz
https://www.wowhead.com/wotlk/quest=6601/ascension
https://www.wowhead.com/wotlk/quest=6602/blood-of-the-*****-dragon-champion
The above is the whole questline you mentioned, and I have taken a look at all the quests to see no red bold text stating that the quest is obsolete like some do.
for example: https://www.wowhead.com/quest=40994/right-tools-for-the-job
Note: it doesn’t matter if it’s retail, if the quest was marked as obsolete, it will appear exactly like that in classic or wrath classic.
I can’t seem to find any blue post confirming that this questline has in fact been removed, I also looked through patch notes which it’s not discussed in there either.
Could you kindly give links to assist me in confirming this please?