fix: resolve duplicated GCS reactions

[haowang-bioinfo]

Main improvements in this PR:

This PR resolves duplicated reactions reported in #524, specifically for the glycine cleavage system (GCS):

• remove lower resolution reaction MAR03923
• remove high resolution set, MAR08435 + MAR08436 + MAR08437, due to the use of generic metabolite, e.g. lipoylprotein (MAM02400m)
• remove generic metabolites lipoylprotein (MAM02400m), S-aminomethyldihydrolipoylprotein (MAM02879m), dihydrolipoylprotein (MAM01703m)
• reduce MAR08433 and MAR08434 GPRs to specific components:
  • MAR08433: ENSG00000178445 and ENSG00000140905
  • MAR08434: ENSG00000140905 and ENSG00000145020

I hereby confirm that I have:

• Tested my code on my own computer for running the model
• Selected develop as a target branch
• Any removed reactions and metabolites have been moved to the corresponding deprecated identifier lists

[feiranl]

LGTM!