[Routing] Fix removing aliases pointing to removed route in RouteCollection::remove()
#52806
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When a route is removed from the collection, we want to remove all aliases pointing to it. The implementation is flawed because the
$aliases
array is indexed by the alias name, and not by the route since several aliases can point to the same route.It'll fix the related issue because added FQCN aliases will be correctly removed when
PrefixTrait::addPrefix()
removes the route before reading it for each locale.