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

Beta Give feedback

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