fix: FluentAutocomplete should throw on use of SelectedOption

[davhdavh]

🐛 Bug Report

FluentAutocomplete throws if setting Multiple to false, but if set/bind the SelectedOption it just doesn't work.

💻 Repro or Code Sample

NA

🤔 Expected Behavior

Throw like Multiple

😯 Current Behavior

Silently does not work

💁 Possible Solution

Alternative to throw would be to set MaximumSelectedOptions to null/1 and fix the code to use it SelectedOption when MaximumSelectedOptions is null/1 to make it consistent with other list components.

[MarvinKlein1508]

I find this behavior quite strange as well. However, I think it might be intentional for some reason, as the exception is explicitly thrown:

fluentui-blazor/src/Core/Components/List/FluentAutocomplete.razor.cs

Line 88 in f9db444

throw new ArgumentException("For FluentAutocomplete, this property must be True. Set the MaximumSelectedOptions property to 1 to select just one item.");

In my opinion, FluentCombobox should be used for single items, while FluentAutocomplete should be used for multiple items. However, I am currently using FluentAutocomplete for single objects as well because FluentCombobox does not support a dynamic item provider.

I've created a small example demonstrating how you can achieve single binding with FluentAutocomplete, which is quite tricky to do. You can find it here:
#2443

Maybe this is something which you can take a look on for v5? I would highly appreciate it.