Summary:
This PR adds [verdaccio](https://github.com/verdaccio/verdaccio) to release packages in the `packages` directory during the E2E test on CI.
The rationale behind this is the following:
- Firstly, we wanted to push the [monorepo RFC](https://github.com/react-native-community/discussions-and-proposals/pull/480). We hit an issue when renaming the packages to follow the same convention caused by the e2e test using the template to fail. This is because the template installs packages from the live version of npm – and if you just rename a package in a given PR without releasing it, the package understandably can't be installed since it's not published, yet – as you can see [here](https://app.circleci.com/pipelines/github/facebook/react-native/15286/workflows/149df51f-f59b-4eb3-b92c-20c513111f04/jobs/282135?invite=true#step-108-283).
- Secondly, the current e2e test on `main` does not actually test the latest code of the packages in the `packages` directory as it simply downloads the latest versions from npm. This creates a divide between what's tested and what users should expect when using nightlies or when a new minor is released.
## Changelog
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[Internal] [Changed] - Use verdaccio for template e2e test
Pull Request resolved: https://github.com/facebook/react-native/pull/34577
Test Plan: `test_js` CI check should pass. Additionally, I have temporarily updated the [PR](https://github.com/facebook/react-native/pull/34572) renaming `assets` to `assets-registry` to include the verdaccio changes – the `test_js` passes there, additionally proving merging this PR will unblock us with the rename PRs.
Reviewed By: cipolleschi
Differential Revision: D39723048
Pulled By: cortinico
fbshipit-source-id: aeff3811967360740df3b3dbf1df50e506fb72d8
fortmarek