e2e testing: add debug handler e2e tests

[lgadban]

(currently disabled) e2e test from previous Gloo impl: https://github.com/kgateway-dev/kgateway/blob/main/test/kubernetes/e2e/features/admin_server/suite.go

[NishantSinghhhhh]

@Igadban,

Sir I’m currently working on the autoHostRewrite feature and am familiar with the test setup. If possible, could I also be assigned to this e2e debug-handler test issue

[timflannagan]

@jenshu Is this issue still relevant?

[jenshu]

we did re-enable the admin server suite but the tests are very minimal right now. don't know if it's worth spending more time now, i'm good with closing it