feat: Updates tests to use fiveg_core_gnb interface #2129

Job	Run time
codeql / CodeQL Analysis (python)	1m 10s
lint-report / lint-report	13s
integration-test / integration-test	13m 43s
static-analysis / static-analysis	18s
create-issue	0s
sync-issues / Update Issue	1s
	15m 25s

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