Decouple build steps to be more flexible #446
                
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As part of this PR I would like to decouple the execution of tests and the local installation of the plugin. In one of my Pull-Requests I wanted to have a quick feedback if the changes are OK without the installation as I was not done yet. To allow users customized options, they are simply decoupled. Install without running tests? No issue.
❌
python build.py --test --installwas not installing anything before my change💹
python build.py --test --installis running the tests and installs gauge-python afterwardsOn top, if you have test failures, the coverage file was not created as part of the
coverage run ...command, so that the lineos.rename(".coverage", f".coverage.{i}")failed: no file available to rename --> FileNotFoundError exception. To overcome this behaviour, I am using the exit-code information to break the look immediately.