remove all uses of -p, --parameter-set with cmsRun

[kpedro88]

This PR is the CRAB version of cms-sw/cmssw#42798.

It is already unnecessary to use the -p or --parameter-set flag before specifying the config.py file for cmsRun, so this PR can be merged immediately with no change in functionality.

After cms-sw/cmssw#42650 is merged, subsequent CMSSW releases will no longer support the -p, --parameter-set flags; the config.py file will always be provided as a positional argument. (This goes toward better command-line argument support following Python standards.)

[cmsdmwmbot]

Can one of the admins verify this patch?

[belforte]

thnaks @kpedro88 I'll take care. Please note that code in test-old is unused. But we'll need to fix documentation as well. I'll do it. But not today

[belforte]

very good, thanks @kpedro88

[belforte]

@kpedro88 this is now deployed on crab preprod instance, I have launched basic validation
but it is usable by others as well.
Simply put this in crabConfig.py

config.section_("General")
config.General.instance = 'preprod'