Add basic CI tests for AthGeneration

Tadej Novak requested to merge tadej/athena:gen-test into master

Add basic CI tests for AthGeneration. This adds ~1.5 min only as tests are very fast. For now no reference comparison is done, but we may want to try it at some point.

This adds PH+Py8, H7, MG+Py8 and Sherpa tests with 13.6 TeV (Run 3). To test the testing machinery this is also done for PH+Py8 for 13 TeV and 14 TeV (Run 2 and Run 4).

/cc @ewelina @jchapman @nstyles @jcatmore @fwinkl

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