Move DependencyGraph.js so the original file is not left over after yarn bundle

[mchowning]

This PR insures that DependencyGraph.js is not left in the root directory after running yarn bundle

Description

Running yarn bundle patches metro to not watch files while bundling (original PR). It does this by copying a patched DependencyGraph.js file into the node_modules folder before bundling that disables watching. Then after bundling is finished it copies the original DependencyGraph.js file back into node_modules, but it (currently) leaves that file at the root of the directory.

This PR uses mv instead of cp when restoring that DependencyGraph.js back to the node_modules folder. As a result, after running yarn bundle there is no longer a leftover DependencyGraph.js file in the root directory.

To Test

1. Run yarn clean:install
2. grab a cup of coffee
3. Run yarn bundle
4. Finish the cup of coffee and grab a fresh cup
5. Verify that both:
   1. yarn bundle completed successfully; and
   2. There is no DependencyGraph.js file in the root folder after the command completes

Once this PR is merged we can remove the references to deleting DependencyGraph.js from our Release Checklist.

PR submission checklist

• I have considered adding unit tests where possible.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[Tug]

LGTM, thanks for fixing this 👍