[C# 15-Fundamentals and reference]: Update on unions
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:checkered_flag: Release: .NET 11
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Description
### .NET 11 Preview
.NET 11 Preview 5
### Link to speclet
- [Speclet](https://github.com/dotnet/csharplang/blob/main/proposals/unions.md)
### Link to Pull request
- [PR](https://github.com/dotnet/roslyn/pull/nnnnn)
### New behavior
For preview 5, more of the `union` based functionality is in place. In addition, some existing features have changed.
Check all spec updates and preview 5 behavior, but the major changes are:
- Member providers are implemented.
- TryGetValue
Pattern matching has updates as well.
### Language reference tasks
_No response_
### Everyday C# tasks
_No response_
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[Associated WorkItem - 580718](https://dev.azure.com/msft-skilling/Content/_workitems/edit/580718)
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