Summary:
When publishing a new flipper plugin, I realized my plugin wasn't showing up in the Plugin Installer search. This was due to a bug where we are only grabbing 50 plugins from NPM and filtering through them locally, instead of passing the search term to the search query. There are 59 plugins that match the keyword filter on npm so 9 plugins never get surfaced.
## Changelog
Fix missing plugins in plugin manager's NPM search
Pull Request resolved: https://github.com/facebook/flipper/pull/2377
Test Plan:
Test the search feature in Plugin Manager
Search for the previously missing package:

Previously working searches continue to work:

Reviewed By: nikoant
Differential Revision: D28831054
Pulled By: passy
fbshipit-source-id: 84442459cd760c3f593b3df5bb3d89d51852e1c4