feat: Updates tests to use fiveg_core_gnb interface #2127

Job	Run time
codeql / CodeQL Analysis (python)	1m 11s
integration-test / integration-test	19m 57s
lint-report / lint-report	18s
static-analysis / static-analysis	17s
create-issue	0s
sync-issues / Update Issue	3s
	21m 46s

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