[Bug] Flaky test occurring when moving from .NET9-preview4 to .NET9-preview6

[jennyf19]

Microsoft.IdentityModel.Protocols.Tests.ExtensibilityTests.ConfigurationManagerUsingCustomClass fails consistently now that we have moved to .NET9-preview6.

Microsoft.IdentityModel.TestUtils.TestException : Microsoft.IdentityModel.Protocols.Tests.ExtensibilityTests.ConfigurationManagerUsingCustomClass

IdentityComparer.AreEqual(configuration.Issuer, configuration2.Issuer)

at Microsoft.IdentityModel.TestUtils.TestUtilities.AssertFailIfErrors(String testId, List`1 errors) in C:__w\1\s\azure-activedirectory-identitymodel-extensions-for-dotnet\test\Microsoft.IdentityModel.TestUtils\TestUtilities.cs:line 369
at Microsoft.IdentityModel.TestUtils.TestUtilities.AssertFailIfErrors(CompareContext context) in C:__w\1\s\azure-activedirectory-identitymodel-extensions-for-dotnet\test\Microsoft.IdentityModel.TestUtils\TestUtilities.cs:line 352
at Microsoft.IdentityModel.Protocols.Tests.ExtensibilityTests.ConfigurationManagerUsingCustomClass() in C:__w\1\s\azure-activedirectory-identitymodel-extensions-for-dotnet\test\Microsoft.IdentityModel.Protocols.Tests\ExtensibilityTests.cs:line 101
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