ci(CodeQuality): exclude test files
As of 3fa9fc8e, https://gitlab.com/gitlab-org/gitlab-ui/-/pipelines/611496436/codequality_report reported "Found 849 code quality issues", but it looks hard to reduce the number of code quality issues. In !2858 (merged), it was found we increased 351 issues in 5 months when GitLab Code Quality has not worked at all.
Adapted from !2858 (merged)
TODO
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Exclude test files