remove enums that aren't used by any slots according to assets/schema_pattern_linting.txt

[turbomam]

doesn't require a migrator?

might be in mixs.yaml

• freq_clean_enum
• organism_count_enum
• plant_growth_med_enum
• samp_md_enum

[turbomam]

There are slots that share names with these enums, like samp_md, 'sample measured depth', which currently has a QuantityValue range.

I have no idea how that relates to these PVs. Too bad there's no annotations.

  samp_md_enum:
    from_schema: http://w3id.org/mixs/terms
    permissible_values:
      DF: {}
      RT: {}
      KB: {}
      MSL: {}
      other: {}

Possibly related: https://en.wikipedia.org/wiki/Depth_in_a_well