[Internal] Remove unnecessary through2 package

[talentlessguy]

Summary

through2 is a legacy dependency and is no longer required. Metro targets Node 18 where Transform streams are stable and do not need a userland package.

Changelog: [Internal] Remove unnecessary through2 package

Test plan

All tests pass on Node 18:

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[robhogan]

Importing to take a closer look and see if we can avoid a couple of those lint warnings, but LGTM, thanks @talentlessguy !

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@robhogan has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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@robhogan merged this pull request in d8bf840.