Draft: update HLTmuon hanconfig to automatically update L1 seed

Closed Valerio Ippolito requested to merge vippolit/athena:vippolit-hanconfig-hltmuon into 23.0

The purpose of this MR is to enable the automatic update in the monitoring of the L1 seed of single-muon chains from L1_MU14FCH to L1_MU18VFCH. Since histograms for many chains are defined in the monitoring, as configured here, it was needed to change the structure of the webdisplay histograms, adding subfolders corresponding to different L1 seeds. This MR implements these changes.

The impact on the structure of the webdisplay can be appreciated comparing the current webdisplay for run 451094 with the new version after this MR.

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