feat: Updates tests to use fiveg_core_gnb interface #2131

Job	Run time
lint-report / lint-report	16s
integration-test / integration-test	32m 40s
codeql / CodeQL Analysis (python)	1m 11s
static-analysis / static-analysis	18s
create-issue	0s
sync-issues / Update Issue	8s
	34m 33s

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