[Routing] Fix: lost priority when defining hosts in configuration

[BeBlood]

Q	A
Branch?	5.4
Bug fix?	yes
New feature?	no
Deprecations?	no
Issues	#58843
License	MIT

When host are configured in routing, the original route is removed from the collection and then re-added. During this process, the route's priority is lost as it's not preserved during the removal and re-addition.

Bug has similarities with #52912 (resolved for prefix)

[carsonbot]

Hey!

I see that this is your first PR. That is great! Welcome!

Symfony has a contribution guide which I suggest you to read.

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Carsonbot

[nicolas-grekas]

Thank you @BeBlood.