Fix detection and propagation of FSRs from input files

Marco Clemencicrequested to merge
fix-fsr-propagation into master

Instead of trying to open the input file (which fails when dealing with LFNs) we use, if available, the new incident introduced with gaudi/Gaudi!1456 (merged).

I also added a new incident to notify possible listeners that an FSR has been read from the input file.

Note: Needs Gaudi v36r13

/cc @cburr @egraveri

Edited by Marco Clemencic

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