feat(create-remote-file-node): add url field to downloaded file nodes (#12582)

<!--
  Have any questions? Check out the contributing docs at https://gatsby.dev/contribute, or
  ask in this Pull Request and a Gatsby maintainer will be happy to help :)
-->

## Description

<!-- Write a brief description of the changes introduced by this PR -->

## Related Issues

<!--
  Link to the issue that is fixed by this PR (if there is one)
  e.g. Fixes #1234, Addresses #1234, Related to #1234, etc.
-->

Author: DarioDiem

packages/gatsby-source-filesystem/src/create-remote-file-node.js

@@ -253,6 +253,7 @@ async function processRemoteNode({
   // Create the file node.
   const fileNode = await createFileNode(filename, createNodeId, {})
   fileNode.internal.description = `File "${url}"`
+  fileNode.url = url
   fileNode.parent = parentNodeId
   // Override the default plugin as gatsby-source-filesystem needs to
   // be the owner of File nodes or there'll be conflicts if any other