ITS: flag to disable 1 histo in track task

[iravasen]

This has to go with AliceO2Group/QualityControl#2203

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
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[JianLIUhep]

Thanks @iravasen for preparing the PR. The code itself is good to be merged.

[iravasen]

Hi @chiarazampolli, Hi @shahor02, can you please merge this PR?