Suppress new warnings in .NET 8 Preview 2 SDK.

(cherry picked from commit 10b1a1e)

Author: bgrainger

.editorconfig

@@ -76,7 +76,10 @@ dotnet_diagnostic.CA1032.severity = none # Implement standard exception construc
 dotnet_diagnostic.CA1062.severity = silent # Validate arguments of public methods.
 dotnet_diagnostic.CA1307.severity = silent # Specify StringComparison for clarity.
 dotnet_diagnostic.CA1508.severity = silent # Avoid dead conditional code.
+dotnet_diagnostic.CA1510.severity = none # Use ArgumentNullException.ThrowIfNull.
+dotnet_diagnostic.CA1513.severity = none # Use ObjectDisposedException.ThrowIf.
 dotnet_diagnostic.CA1849.severity = none # Call async methods when in an async method.
+dotnet_diagnostic.CA1859.severity = silent # Use concrete return types for performance.
 dotnet_diagnostic.CA2000.severity = none # Use recommended Dispose pattern.
 dotnet_diagnostic.CA2100.severity = none # Review SQL queries for security vulnerabilities.
 dotnet_diagnostic.CA2213.severity = silent # Disposable fields should be disposed.