Sync shared code from aspnetcore

[github-actions]

This PR was automatically generated to sync shared code changes from aspnetcore. Fixes dotnet/aspnetcore#18943

[eerhardt]

cc @amcasey

[amcasey]

I'm going to claim that my tests didn't break this

multiple attempts to download the nupkg have failed

[amcasey]

[15:28:14] info: [FAIL] System.Tests.StringSplitTests.SplitCharSeparator(value: ",first,second,third,", separator: ',', count: 2147483647, options: None, expected: ["", "first", "second", "third", ""])
[15:28:14] info: Assert.Equal() Failure: Exception thrown during comparison
[15:28:14] info:                                         ↓ (pos 4)
[15:28:14] info: Expected: [null, "", "first", "second", "third"]
[15:28:14] info: Actual:   ["", "first", "second", "third", ""]
[15:28:14] info:                                            ↑ (pos 4)
[15:28:14] info: ---- System.NullReferenceException : Object reference not set to an instance of an object.
[15:28:14] info:    at System.Object.InvokeStub_StringSplitTests.SplitCharSeparator(Object , Span`1 )
[15:28:14] info:    at System.Reflection.MethodBaseInvoker.InvokeWithManyArgs(Object , BindingFlags , Binder , Object[] , CultureInfo )
[15:28:14] info: ----- Inner Stack Trace -----

[amcasey]

Likely related to #105362