[Blazor] JS assets in `Microsoft.AspNetCore.Components.CustomElements` are not getting included

[MackinnonBuck]

In the release/9.0 branch, JS assets are not being correctly included in Microsoft.AspNetCore.Components.CustomElements. This causes RegisterCustomElement() to throw with the following exception message:

Error: Could not find 'registerBlazorCustomElement' ('registerBlazorCustomElement' was undefined).

[javiercn]

@MackinnonBuck is this something we need to address in 10.0?

[MackinnonBuck]

Closing as this was addressed in release/9.0. The main branch already received the fix.