feat: support custom token endpoint from service account credentials#6277

stackitcarlos wants to merge 2 commits intostackitcloud:mainstackitcloud/stackit-sdk-go:mainfrom

stackitcarlos:feature/1246_service_account_key_token_endpointstackitcarlos/stackit-sdk-go:feature/1246_service_account_key_token_endpointCopy head branch name to clipboard