Support NanoFlavours in PromptReco workflows

[LinaresToine]

Impact of the new feature
WMAgent

Is your feature request related to a problem? Please describe.
PPD is requesting T0 to allow different types of nanoaod, known as nano flavours, to be configured in the T0 configuration.

Describe the solution you'd like
The solution for this also requires additions in the T0 code. See dmwm/T0#5031.
As for the WMCore part of the solution, I describe the chain of events to better illustrate the context:

• T0 collects all dataset configuration parameters in addDataset

• The new nano_flavours parameter is taken in Tier0Config.py

• The parameter nano_flavours then takes the form of datasetConfig.NanoFlavours, which is used in RunConfig.releasePromptReco

• At this point, the parameter datasetConfig.NanoFlavours goes as a spec argument for the PromptReco worklow. This reaches the WMCore code through getWorkloadCreateArgs, where the self.nanoFlavours is created and used in the final scenarioArgs dictionary in PromptRecoWorkloadFactory.buildWorkload before taken by the CMSSW code in the promptReco() function: cmssw Reco.promptReco.

Describe alternatives you've considered
See description above

Additional context
The related WMCore PR is #12235