Re-compute polarized DIS predictions with fixed Yadism and EKO

[Radonirinaunimi]

We need to re-compute all the Polarized DIS FK table predictions making sure that:

• the grids include the updated type of initial state for the metadata
• they are generated with the fixed version of EKOs
• we no longer rely on the k-factors to compute $g_1$ and the asymmetries (because of improvements in n3fit)

These predictions include all the combinations of ZM and FONLL for the perturbative orders NLO and NNLO.

Tasks

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1. Deprecate info on initial states and polarized key #289
   enhancement physics +2
   
2. Observable card generators for pDIS #232
   datatoolchain +1
   
3. Allow for F1 FKtables in G1F1 ratio nnpdf#2122
   Polarised data toolchain +2
   
4. Update pol DIS cards pinecards#181
   polarised +1
   

[giacomomagni]

The various tasks have been addressed in the corresponding PRs