Rewrite 3 MemoryCache tests to not be timing sensitive #72890
Description
GetAndSet_AreThreadSafe_AndUpdatesNeverLeavesNullValues
OvercapacityPurge_AreThreadSafe
AddAndReplaceEntries_AreThreadSafe
These were inherited from aspnet/caching but have been disabled as they need rewriting to not be racy.
example failure
System.AggregateException : One or more errors occurred.
---- System.Threading.Tasks.TaskCanceledException : A task was canceled.
Stack trace
at System.Threading.Tasks.Task.WaitAll(Task[] tasks, Int32 millisecondsTimeout, CancellationToken cancellationToken)
at Microsoft.Extensions.Caching.Memory.MemoryCacheSetAndRemoveTests.OvercapacityPurge_AreThreadSafe() in /_/src/libraries/Microsoft.Extensions.Caching.Memory/tests/MemoryCacheSetAndRemoveTests.cs:line 655
----- Inner Stack Trace -----