Use WinGet repository manifest path for 'Learn more'

[mdanish-kh]

Summary of the pull request

In case of empty metadata in the application manifest (no PublisherUrl or PackageUrl), instead of Learn more button redirecting them to https://github.com/microsoft/winget-pkgs, we can offer better navigation if we take them to the manifest folder within the repository

References and relevant issues

Didn't see any for this, just thought it would be helpful if we can better redirect the user in these cases

Detailed description of the pull request / Additional comments

Validation steps performed

Validated manually. One can test by searching for applications 5E.5EClient, DEVCOM.JetBrainsMonoNerdFont, Samsung.GalaxyBudsManager

PR checklist

• [ ] Closes #xxx
• [ ] Tests added/passed
• [ ] Documentation updated