tests: introduce golden tests in kong chart using chartsnap #72

Job	Run time
lint	2m 10s
lint-test (kong)	12m 20s
lint-test (ingress)	2m 39s
golden-tests	28s
integration-test (1.23.13, kong)	4m 11s
oldversion-integration-test (2.10, 3.3, kong)	2m 8s
integration-test (1.23.13, ingress)	2m 32s
oldversion-integration-test (2.10, 3.3, ingress)	2m 9s
integration-test (1.24.7, kong)	3m 14s
oldversion-integration-test (2.10, 3.2, kong)	2m 23s
integration-test (1.24.7, ingress)	3m 14s
oldversion-integration-test (2.10, 3.2, ingress)	2m 7s
integration-test (1.25.9, kong)	3m 27s
oldversion-integration-test (2.11, 3.3, kong)	2m 21s
integration-test (1.25.9, ingress)	2m 51s
oldversion-integration-test (2.11, 3.3, ingress)	2m 18s
integration-test (1.26.4, kong)	3m 11s
oldversion-integration-test (2.11, 3.2, kong)	2m 28s
integration-test (1.26.4, ingress)	3m 34s
oldversion-integration-test (2.11, 3.2, ingress)	2m 5s
integration-test (1.27.1, kong)	2m 54s
integration-test (1.27.1, ingress)	2m 50s
passed	1s
	1h 7m 35s

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