fix: add verdaccio generated files to .gitignore (#41783)

Summary:
When working with Verdaccio (testing the template, releasing packages) - I've stumbled upon a lot of changes in the repo:

![CleanShot 2023-12-04 at 13 14 12@2x](https://github.com/facebook/react-native/assets/52801365/74ce53a2-b885-41f4-9a12-968a8577285e)

## Changelog:

[INTERNAL] [ADDED] - Add verdaccio generated files to .gitignore

Pull Request resolved: https://github.com/facebook/react-native/pull/41783

Test Plan: CI Green

Reviewed By: christophpurrer

Differential Revision: D51808583

Pulled By: huntie

fbshipit-source-id: fec2a13883590d0c6af179c3804fba9d4235dde2