fix(kuma-cp): handle external services with permissive mtls (backport of #7179)

[kumahq]

Automatic cherry-pick of #7179 for branch release-2.0

Generated by action

cherry-picked commit 6e228b7
⚠️ ⚠️ ⚠️ Conflicts happened when cherry-picking! ⚠️ ⚠️ ⚠️

On branch release-2.0
Your branch is up to date with 'origin/release-2.0'.

You are currently cherry-picking commit 6e228b7e5.
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Changes to be committed:
	new file:   test/e2e_env/kubernetes/externalservices/permissive_mtls.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   pkg/xds/context/mesh_context_builder.go
	both modified:   test/e2e_env/kubernetes/kubernetes_suite_test.go