sdist contains a lot of .json.orig files

[frenzymadness]

When packaging JupyterLab for Fedora Linux, the review process uncovered that there are a lot of *.json.orig files in the distributed source tarball:

$ find ./ -name "*.json.orig"
./jupyterlab/schemas/@jupyterlab/application-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/apputils-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/cell-toolbar-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/codemirror-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/completer-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/console-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/csvviewer-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/debugger-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/docmanager-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/documentsearch-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/extensionmanager-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/filebrowser-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/fileeditor-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/help-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/htmlviewer-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/hub-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/imageviewer-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/inspector-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/launcher-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/logconsole-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/lsp-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/mainmenu-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/markdownviewer-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/metadataform-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/notebook-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/running-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/settingeditor-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/shortcuts-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/statusbar-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/terminal-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/toc-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/tooltip-extension/package.json.orig
./jupyterlab/schemas/@jupyterlab/translation-extension/package.json.orig

Those files seem to be useless and JupyterLab works fine without them. I guess that they are created during the build here:

jupyterlab/builder/src/build.ts

Lines 184 to 187 in c6180ce

	fs.copySync(
	path.join(packageDir, 'package.json'),
	path.join(destination, 'package.json.orig')
	);

I think they should be excluded from the sdist.

[JasonWeill]

@blink1073 @bollwyvl Thoughts on whether these .json.orig files need to be in source control?

[blink1073]

They're ignored by .gitignore, and are there mostly for the person building to have a reference. I'd say they can be removed from the sdist similar to the .js.map files here.