fix(typescript-estree): do not call export of clearProgramCache

[sandersn]

Calling it exports undefined instead of making it an alias of clearCaches, which I believe was the intent.

On DefinitelyTyped, I worked around the problem; clearProgramCaches isn't needed now anyway.

[typescript-eslint]

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[bradzacher]

🤦‍♂️ Thanks for this.

[codecov]

Codecov Report

Merging #6540 (b964b10) into main (678ed41) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6540   +/-   ##
=======================================
  Coverage   90.66%   90.66%           
=======================================
  Files         376      376           
  Lines       12851    12851           
  Branches     3783     3783           
=======================================
  Hits        11651    11651           
  Misses        856      856           
  Partials      344      344           

Flag	Coverage Δ
unittest	90.66% <100.00%> (ø)

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Impacted Files	Coverage Δ
packages/typescript-estree/src/clear-caches.ts	100.00% <100.00%> (ø)