chore: remove support for private go modules #549

Job	Run time
Lint Helm Charts	33s
Lint Go	2m 17s
Version Check	6s
Lint YAML	31s
Check License	10s
Lint Dockerfiles	34s
Build and publish containers (awsSmProxy)	2m 57s
Build and publish containers (squidProxy)	1m 57s
Build and publish containers (secretsConfig)	3m 12s
Build and publish containers (authService)	2m 14s
Build and publish containers (tokenFS)	2m 54s
Build and publish containers (certSynchronizer)	3m 35s
Build and publish containers (tenancyManager)	2m 47s
Build and publish containers (keycloakTenantController)	3m 9s
Build and publish containers (tenancyDatamodel)	1m 28s
Build and publish containers (tenancyAPIMapping)	2m 2s
Build and publish containers (openAPIGenerator)	1m 54s
Build and publish containers (nexusCompiler)	5m 9s
Build and publish containers (nexusAPIGateway)	3m 1s
Build and publish Helm charts	33s
Test Go	9m 38s
Version Tag	25s
	51m 6s

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