Missing sourcemaps

[Rigidoont]

At the end of every .js file there is a URL to their source maps, but there are no sourcemaps present in the installed package directory.

For example, at the end of the file node_modules\google-auth-library\build\src\auth\authclient.js there is a row:
//# sourceMappingURL=authclient.js.map

That sourceMappingURL is pointing to a non-existent file. Chrome devtools' console is complaining about it a lot, it shows ~25 messages of missing sourcemaps for the files of this library.

[danielbankhead]

We've removed source maps in our other libraries to keep the deliverables small (same with others, like nodejs-storage):

• feat!: disable source maps for smaller bundle size nodejs-storage#2240

I've created a PR to remove the broken source maps.