Add custom message to NavigationException

[carlos-regis]

Fixes #51787

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Summary of the changes:

• Overrides the Message property for the NavigationException

[carlos-regis]

@danmoseley Please let me know if you want to customize the message with more specific details.

[carlos-regis]

@javiercn @mkArtakMSFT fyi this PR closes #51787

[danmoseley]

Thanks @carlos-regis. I'll let Blazor owners review. Can you remove the extra whitespace you added?
Is a simple test feasible? It would simply check the URI was somewhere in the message.

[carlos-regis]

Thanks @carlos-regis. I'll let Blazor owners review. Can you remove the extra whitespace you added? Is a simple test feasible? It would simply check the URI was somewhere in the message.

@MackinnonBuck could you please provide me with some guidance on this test? regarding where in the codebase should I create it and what else you think would be nice to know as this is my first contrib for the blazor area.

[MackinnonBuck]

Since there hasn't been activity in a while, we're going to close this out in favor of #56644