fix(theme): remove field-disabled, layer-disabled tokens

[tay1orjones]

Closes #9832
Related #10292 (comment)

These were missed in the original PR for #9832.

Changelog

Changed

• migrate usages of $field-disabled to use $field
• migrate usages of $layer-disabled to use $layer

Removed

• theme: remove field-disabled and layer-disabled tokens

Testing / Reviewing

• "Find all" search in the repo for each field-disabled, fieldDisabled, layer-disabled, layerDisabled should return no results.
• Take a look at stories for components impacted to ensure usage is valid:
  • text input
  • search
  • select
  • number input
  • date picker
  • dropdown
  • text area

[aagonzales]

LGTM, thanks for updating!

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