Reverts Cancellation on SslStream

[Drawaes]

Checking that this now passes the outerloop

[Drawaes]

@dotnet-bot test Outerloop Linux x64 Debug Build please
@dotnet-bot test Outerloop Linux x64 Release Build please

[Drawaes]

ref #25198

[Drawaes]

@dotnet-bot test Linux arm Release Build please

[Drawaes]

/cc @stephentoub

Okay so this has 1 socket failure on Suse for
Socket_StaticConnectAsync_HostNotFound

Which is unrelated, but it confirms that reverting the cancellation puts SslStream back into a functioning state. I would say it should be put back to here and cancellation can be looked at again.

#25198 Shows a no-op PR that has the failures

Ubuntu 14.04 seems to be non responsive for whatever reason, maybe they are all in use?

[Drawaes]

Outerloop Linux x64 Release Build — Build finished.

That outerloop finished fine, with 100% pass rate.

[Drawaes]

@dotnet-bot test Outerloop Linux x64 Debug Build please

[benaadams]

Failure is SendAsync_ExpectedDiagnosticCancelledActivityLogging

at System.Diagnostics.RemoteExecutorTestBase.RemoteInvokeHandle.Dispose() in /mnt/j/workspace/dotnet_corefx/master/linux-TGroup_netcoreapp+CGroup_Debug+AGroup_x64+TestOuter_true_prtest/src/CoreFx.Private.TestUtilities/src/System/Diagnostics/RemoteExecutorTestBase.cs:line 205
at System.Net.Http.Functional.Tests.DiagnosticsTest.SendAsync_ExpectedDiagnosticCancelledActivityLogging() in /mnt/j/workspace/dotnet_corefx/master/linux-TGroup_netcoreapp+CGroup_Debug+AGroup_x64+TestOuter_true_prtest/src/System.Net.Http/tests/FunctionalTests/DiagnosticsTests.cs:line 589

Assume unrelated..?

/cc @stephentoub

[stephentoub]

Thanks for investigating. Reverting in #25203.