Add debugger display to CancellationTokenSource

[hootanht]

Fixes #105698

Add DebuggerDisplayAttribute to CancellationTokenSource to show cancellation and disposal status.

• CancellationTokenSource.cs

  • Add DebuggerDisplayAttribute to the CancellationTokenSource class.
  • Display the cancellation status in the DebuggerDisplayAttribute.
  • Display the disposal status in the DebuggerDisplayAttribute.

• DebuggerAttributes.cs

  • Add a test method to validate the DebuggerDisplayAttribute for CancellationTokenSource.
  • Ensure the test method checks the cancellation status.
  • Ensure the test method checks the disposal status.

[hootanht]

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[hootanht]

@dotnet-policy-service agree

[stephentoub]

Thanks, but there's already an open pr for this:
#105764