Replace test-on-gdk with test-on-cng in backport mr pipelines
What does this MR do and why?
Remove test-on-gdk
with test-on-cng
. See attached issue for more details.
References
Closes: Replace e2e:test-on-gdk to use e2e:test-on-cng ... (gitlab-com/gl-infra/delivery#21286 - closed)
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