fix(expo): Do not publish plugin tests and sources to NPM

[barthap]

Description

I noticed that the whole plugin directory is published to NPM. The only subdirectory really needed is plugin/build, others (src, tests) can be npm-ignored to make the package smaller.

The plugin/build dir is generated from plugin/src during npm prepare step. Its content is required by the app.plugin.js file.

Related issues

Release Summary

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

🤷

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react-native-firebase – ./

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react-native-firebase-next – ./website_modular

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[codecov]

Codecov Report

Merging #5565 (761209f) into master (6cb035c) will increase coverage by 3.62%.
The diff coverage is n/a.

❗ Current head 761209f differs from pull request most recent head 3a41e2c. Consider uploading reports for the commit 3a41e2c to get more accurate results

@@             Coverage Diff              @@
##             master    #5565      +/-   ##
============================================
+ Coverage     67.56%   71.17%   +3.62%     
============================================
  Files           199      106      -93     
  Lines          9659     4405    -5254     
  Branches       1510      941     -569     
============================================
- Hits           6525     3135    -3390     
+ Misses         2719     1173    -1546     
+ Partials        415       97     -318     

[mikehardy]

Ah, good catch. Normally I'm a big proponent of shipping source with the package (to enable "drive-by" PRs via patch-package and the like), but in a monorepo that's not really even possible, so it is just inflating the package size with no benefit I can see