Chore: npmignore tsconfig.* files.

[StringEpsilon]

Summary

Removes unnecessary files from build output / resulting package archive. Reduces install size.

Fixes #8639

Test plan

Build packages, check resulting archives for tsconfig.json and tsconfig.tsbuildinfo

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[codecov-io]

Codecov Report

Merging #8641 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #8641   +/-   ##
======================================
  Coverage    63.4%   63.4%           
======================================
  Files         274     274           
  Lines       11342   11342           
  Branches     2770    2771    +1     
======================================
  Hits         7191    7191           
  Misses       3534    3534           
  Partials      617     617

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[SimenB]

Thanks!

[StringEpsilon]

I signed the CLA. Not sure why the bot didn't update.

[github-actions]

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