Display NuGet Package Explorer link on details page.

[dannyjdev]

Summary of the changes:

• A link was added for both detail page versions (current, tabs).
• The link sends you to a nuget.info page where you can see the package assets.
• The link will only be displayed when the package is "Available", to avoid sending the user to a broken/non ready page.
• When you click the link it goes to a new page instead of using the current one.
• Minor refactor to the FuGet link to behave like this one.

DisplayPackage page:

DisplayPackageV2 page:

Addresses #8428

[joelverhagen]

I don't think we should be using target="_blank". This is different behavior than the project URL or repo URL which I don't see as categorically different. However I don't feel strongly.

[joelverhagen]

What was the motivation for this change on the FuGet link? Perhaps I am missing something

[dannyjdev]

With target="_blank" we open a new browser tab with the Fuget/NPE page while keeping the current NuGet display package page. Since those links sends you to a 3rd party site, I think it's better to have our NuGet display package page open while the user go and see those sites for more information. Basically to avoid the user to go backwards on the browser history to return to the same NuGet display package page.

[joelverhagen]

Looks good to me! Thanks for cleaning up the old, IE-only thing 👏.

Wanna take a final look, @jcjiang + @clairernovotny?