Read GraphQL PackageLinks to render link to package details page

What does this MR do and why?

This MR:

• Updates GraphQL query as follow-up to Add _links object to the Package GraphQL API (!101416 - merged)
• Updates component to render router-link only when _links.webPath contains link to details page
• fallback to rendering just the text if _links.webPath is null

Screenshots or screen recordings

No visual changes

How to set up and validate locally

1. Follow instructions to publish a new packages

2. Visit package registry list page for groups & projects.

3. Should be able to click the link and view the package detail page

4. Now change package status to error. This updates the status for the last created package

     Packages::Package.last.update!(status: "error")

5. Replace app/graphql/types/packages/package_links_type.rb Line14-16 with

      def web_path
        return unless object.default?
   
        package_path(object)
      end

6. Confirm that the package is not clickable on the package registry list page.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #344257 (closed)