Migrate "app/assets/javascripts/environments/components/canary_ingress.vue" to GlDisclosureDropdown or GlCollapsibleListbox

One or more dropdowns in app/assets/javascripts/environments/components/canary_ingress.vue should be migrated to one of the new dropdown components. See the parent epic for guidance on migration strategies.

Technical proposal

Judging from the code, the required change looks straightforward. The GlDropdown component used in canary_ingress should be replaced with GlCollapsibleListbox component, using the mapping of ingressOptions to the format expected from GlCollapsibleListbox