Fix detection and propagation of FSRs from input files

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