Add test directory to npm ignore to avoid problems with FlowJS

[alexander-schranz]

Flow JS is since the latest release failing in our cases with:

Error ┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈ node_modules/resolve/test/resolver/malformed_package_json/package.json:2:1

Unexpected end of input, expected the token }

See also: https://github.com/sulu/sulu/runs/4761348253?check_suite_focus=true

I think the whole test directory is not required to be in the publish packages and so it will reduce also the download size of this package.

Alternative ignore that specific malformed file in npm pack: #270

[ljharb]

No, you’ve just posted 2 duplicate PRs to this repo - this and #270 - to “fix” something that isn’t broken. This file is intentionally published (as are all tests) and must forever be, and the solution is to flowignore the file until flow fixes its bug that crashes on third party files.

See #262.