Add files to simulate bbtomuons without forcing semileptonic decay

[motomioya]

Add files and scripts to simulate bb -> mumu with natural decays. This includes modifications to GeneratorBeautyToMu_EvtGenFwdY().

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
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[benedikt-voelkel]

Approving to steer CI.

[benedikt-voelkel]

Dear @motomioya
I approved to steer the CIs.
Now there is new ini file introduced by your PR: MC/config/PWGDQ/ini/GeneratorHF_bbbarToDDbarToMuons_fwdy.ini
Since these might be used to configure generators in production, we ask for a test that has to be implemented in addition. These tests should be macros that would check that your generator did was is expected.

An example

• ini file: https://github.com/AliceO2Group/O2DPG/blob/master/MC/config/PWGDQ/ini/GeneratorHF_JPsiToMuons_fwdy.ini
• corresponding test: https://github.com/AliceO2Group/O2DPG/blob/master/MC/config/PWGDQ/ini/tests/GeneratorHF_JPsiToMuons_fwdy.C

Documentation: https://aliceo2group.github.io/simulation/docs/generators/generatorconfig.html#generator-tests

Please let me know if you have additional questions.

[motomioya]

Dear @benedikt-voelkel
Thank you for the comment. I added a new file to MC/config/PWGDQ/ini/tests/GeneratorHF_bbbarToDDbarToMuons_fwdy.C for the new ini file test. I checked that it works and the test is successful in my local environment.

[benedikt-voelkel]

Amazing, thanks a lot!
I triggered the CI test to run, let's see how it goes!