test(no-release): use assert or require only

Oleksandr Redkorequested to merge
gitlab-community/gitlab-org/api/client-go:test/assert-require into main

Replace all t.Error, t.Errorf, t.Fatal, t.Fatalf with assert or require.

Enable forbidigo pattern to prevent regressions. It's the last PR of this type.

Updates #2206 (closed)

Edited by Oleksandr Redko

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