fix(MeshTrafficPermission): use serviceName instead of resource name for egress MTP (backport of #7225)

[kumahq]

Automatic cherry-pick of #7225 for branch release-1.8

Generated by action

cherry-picked commit e6ced10
⚠️ ⚠️ ⚠️ Conflicts happened when cherry-picking! ⚠️ ⚠️ ⚠️

On branch release-1.8
Your branch is up to date with 'origin/release-1.8'.

You are currently cherry-picking commit e6ced1005.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   pkg/plugins/policies/meshtrafficpermission/plugin/v1alpha1/plugin.go
	deleted by us:   pkg/plugins/policies/meshtrafficpermission/plugin/v1alpha1/plugin_test.go
	deleted by us:   test/e2e_env/multizone/meshtrafficpermission/meshtrafficpermission.go

no changes added to commit (use "git add" and/or "git commit -a")

[lukidzi]

Not implemented