Test failure: KeepAlivePingDelay_Infinite_NoKeepAlivePingIsSent

[karelz]

Test type: System.Net.Http.Functional.Tests.SocketsHttpHandler_Http2KeepAlivePing_Test

Failures 3/12-9/6 (incl. PRs):

Day	Run	OS
8/26	PR #58092 - main	Windows.10.Amd64.Server19H1.ES.Open
9/3	PR #58336 - release/6.0	Ubuntu.1604.Amd64.Open

Failure:

System.TimeoutException : The operation has timed out.

   at System.Net.Http.Functional.Tests.SocketsHttpHandler_Http2KeepAlivePing_Test.KeepAlivePingDelay_Infinite_NoKeepAlivePingIsSent() in /_/src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.Http2KeepAlivePing.cs:line 45
--- End of stack trace from previous location ---

[rzikm]

No recent hits on main in last 30 days. Closing until it resurfaces