[Blazor] Allow ability to change page title dynamically.

[rxelizondo]

Sometimes you may want to change the page title dynamically depending on certain circumstances. As far as I can see, the page title is set on index.html and given that this is just a regular html page I can’t use something like razor syntax to perhaps call a function that would get the correct page title dynamically.

I realize that there are other ways to accomplish this such as using JavaScript but it would be nice to not have to.

[mkArtakMSFT]

This will be covered as part of #10450