PR title and source.json should incl packaged version

[christoph-jerolimov]

PRs like this:

• Add npm workspace to commit 335037a for backstage 1.35.0 on branch release-1.5 rhdh-plugin-export-overlays#948

makes it difficult to understand which version this bundles. For me it looks like it picks a "random" Git hash/repo-ref. But @davidfestal explained me that it already picks up the latest release of an npm package.

To make it more explicit and readable I like to suggest that the title should include that npm version.

It would be nice if the source.json also includes this version. This makes it easier later to grep the repo for specific versions.

Current workspaces/npm/source.json (manually formatted for readability):

{
  "repo": "https://github.com/backstage/community-plugins",
  "repo-ref": "335037a9f57eef5a989363cb9779cfaeb8c81f9b",
  "repo-flat": false
}

And kind of extra attributes like this would be great:

{
  "repo": "https://github.com/backstage/community-plugins",
  "repo-ref": "335037a9f57eef5a989363cb9779cfaeb8c81f9b",
  "repo-flat": false,
  "workspace-path": "workspaces/npm",
  "npm-version": "1.0.0"
}