MuGirl - make functions called in execute const

Nicolas Koehler requested to merge nkoehler/athena:muInsOutPriv into master

Hi,

this MR makes several of the functions inside the MuGirl packages that are called during execute const. Remark for the shifters: the MuonRecoValidationTool is a not thread safe tool which can be added for validation/debugging checks when running with one thread. It is not included in multi-threaded production jobs, so not making it thread-safe here.

Best, Nico

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