Term merge: GO:1903510 mucopolysaccharide metabolic process GO:0030203 glycosaminoglycan metabolic process

[sjm41]

• Term to be merged: Provide GO ID and term label
  id: GO:1903510
  name: mucopolysaccharide metabolic process
  namespace: biological_process
  def: "The chemical reactions and pathways involving mucopolysaccharide." [GO_REF:0000068, GOC:dph, GOC:TermGenie, PMID:4236091]

• Which term do you propose this term merge into? Provide GO ID and term label
  id: GO:0030203
  name: glycosaminoglycan metabolic process
  namespace: biological_process
  def: "The chemical reactions and pathways involving glycosaminoglycans, any of a group of polysaccharides that contain amino sugars." [ISBN:0192800981]

• Reason for merge
  'mucopolysaccharide metabolic process' isn't a necessary or useful grouping term.
  Moreover, several sources say that'mucopolysaccharide' is synonymous with glycosaminoglycan:
  https://en.wikipedia.org/wiki/Glycosaminoglycan
  https://www.ninds.nih.gov/health-information/disorders/mucopolysaccharidoses
  https://www.ncbi.nlm.nih.gov/books/NBK544295/

• Reference(s)
  see above

• Any other information
  Tree under 'glycosaminoglycan metabolic process' currently looks like this:

|__glycosaminoglycan metabolic process
        |__glycosaminoglycan biosynthetic process
        |   |__chondroitin sulfate biosynthetic process
        |   |__dermatan sulfate biosynthetic process
        |   |__heparin biosynthetic process
        |   |__hyaluronan biosynthetic process
    	|   |__keratan sulfate biosynthetic process
        |   |__peptidoglycan biosynthetic process(+)
        |__glycosaminoglycan catabolic process 
        |   |__chondroitin sulfate catabolic process
        |   |__dermatan sulfate catabolic process
        |   |__heparin catabolic process
        |   |__hyaluronan catabolic process
        |   |__keratan sulfate catabolic process
        |   |__peptidoglycan catabolic process
        |__mucopolysaccharide metabolic process
        |   |__chondroitin sulfate metabolic process(+)
        |   |__dermatan sulfate metabolic process(+)
        |   |__heparin metabolic process(+)
        |   |__hyaluronan metabolic process(+)
        |   |__keratan sulfate metabolic process(+)
        |__peptidoglycan metabolic process
            |__peptidoglycan biosynthetic process(+)
            |__peptidoglycan catabolic process
            |__peptidoglycan turnover

Also see #29293

[pgaudet]

I think we can merge!