Fix for GitLab 15.0: cobertura replaced by coverage_report

Mark Andrews requested to merge marka-cobertura-replaced-by-coverage_report into main

artifacts:reports:cobertura keyword

As of GitLab 15.0, the artifacts:reports:cobertura keyword has been replaced by artifacts:reports:coverage_report. Cobertura is the only supported report file, but this is the first step towards GitLab supporting other report types.

Edited by Petr Špaček

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