EventsPerBC calibration task for FT0 (O2-6563)

[wpierozak]

Implements the EventsPerBC calibration task for FT0, which generates a histogram of VTX events above a defined amplitude threshold plotted against the BC.

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
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The following labels are available
async-2023-pbpb-apass4
async-2023-pp-apass4
async-2024-pp-apass1
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async-2024-PbPb-apass1
async-2024-ppRef-apass1
async-2024-PbPb-apass2
async-2023-PbPb-apass5

[shahor02]

Thanks @wpierozak , a few comments below.

[shahor02]

Thanks, to me looks good. I guess FIT experts will merge it.

[sawenzel]

Could we please have a human-readable description of what this PR achieves (in the title and description field above). Would be helpful for feature tracking and release notes etc.