Describe the bug

The default value for ShutdownTimeout in Microsoft.Extensions.Hosting.HostOptions was updated to 30 seconds as part of dotnet/runtime#63709

The default value for ShutdownTimeout in WebHostOptions should be made consistent with this so that the default shutdown behaviour is consistent for services using GenericWebHostService and WebHost.

Expected Behavior

Default values for HostOptions.ShutdownTimeout and WebHostOptions.ShutdownTimeout should match for consistent stopping behaviour across both when ShutdownTimeout has not been set via configuration (Config for key: shutdownTimeoutSeconds)

Steps To Reproduce

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Exceptions (if any)

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.NET Version

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Anything else?

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