fix: use parameters in config.NewClient and Jobs.DownloadArtifactsFile

Oleksandr Redkorequested to merge
gitlab-community/gitlab-org/api/client-go:fix/unused-parameters into main

This MR fixes the config.NewClient function and the Client.JobsService.DownloadArtifactsFile method. These functions had unused parameters, which is a bug, and those parameters should be used.

The issue was identified with the help of the revive.unused-parameter rule.

The MR also adds unit tests to ensure everything works correctly. These tests fail before the fix.

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