fix/feat(parsers, MN): fix json parsing error and add coal data

[consideRatio]

Issue

For #5906 that should resolve after a while if it works by its own.

Description

The JSON API used had a new format which broke the parser.

• I made it so that wind data is now collected from another key clearly for the wind data based on seeing a wind power icon used to represent it.
  
• I ignored the JSON API key Songino as it wasn't obvious enough what to do about it, but it could be battery storage perhaps based on the icon, see discussion following MN production parser down #5906 (comment).
• See also highlighted decision below

Highlighted decision

• I mapped dts to coal, even without understanding what dts refers to.
  • It seems that the previous parser's unknown calculation was calculating the same value dts is set to
  • It seems that it's a coal, oil, or gas plant dts represents based on the icon for it in https://ndc.energy.mn/
  • It seems that Mongolia's electricity production is dominated by coal (https://en.wikipedia.org/wiki/Energy_in_Mongolia).

Double check

• I have tested my parser changes locally with poetry run test_parser "zone_key"
• I have run pnpx prettier@2 --write . and poetry run format in the top level directory to format my changes.

[consideRatio]

This calculation maps exactly to the dts value, which is presented in the website https://ndc.energy.mn/ as:

Due to this, I figure it should be used directly. If it should be coal or unknown is not in any way obvious in my mind - whats clear is that Mongolia is mostly using coal though, and they didn't mind reporting this as some kind of fossil power plant with the icon.

[consideRatio]

Force pushed a rebase on master.

[VIKTORVAV99]

LGTM! 🎉