chore: remove unused ambient types

[dnalborczyk]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

Description

removes leftover ambient type definitions for acorn-plugins.

[codecov]

Codecov Report

Merging #4212 (1c1ffd2) into master (c41d17c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4212   +/-   ##
=======================================
  Coverage   98.37%   98.37%           
=======================================
  Files         202      202           
  Lines        7259     7259           
  Branches     2119     2119           
=======================================
  Hits         7141     7141           
  Misses         58       58           
  Partials       60       60           

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