Add option to disable GUI commands to NoFairMQ histo server binary

Tested in my local copy on mfles:

• without the new option, the three commands are visible in the web-browser
• with the new option --hideguicmds, the commands are not there

added Online QA mCBM labels

requested review from @s.zharko

assigned to @p.-a.loizeau

Dear @f.uhlig, @v.friese, @p.-a.loizeau,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

merged