Support for scoped templates

[piranna]

Add support for templates published as scoped packages. Partially fixes #18973.

Test Plan

Published a template as a scoped package and installed it.

Related PRs

Documentation doesn't says nothing regarding lack of support for scoped packages, so intuitively they should work. This pull-request just makes that intuitive assumption true, so I think no changes on documentation are needed.

Release Notes

[CLI] [BUGFIX] [local-cli/generator/templates.js] - Support for scoped npm packages as templates

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[facebook-github-bot]

@piranna I tried to find reviewers for this pull request and wanted to ping them to take another look. However, based on the blame information for the files in this pull request I couldn't find any reviewers. This sometimes happens when the files in the pull request are new or don't exist on master anymore. Is this pull request still relevant? If yes could you please rebase? In case you know who has context on this code feel free to mention them in a comment (one person is fine). Thanks for reading and hope you will continue contributing to the project.

[cpojer]

Thank you for your PR. We just moved this code to https://github.com/react-native-community/react-native-cli so please submit your PR there.