Backport TLS test minimum OS (#33714)

Backport part of fe6a3fc to address the flaky test in release/5.0

Author: BrennanConroy

src/Servers/Kestrel/test/InMemory.FunctionalTests/EventSourceTests.cs

@@ -268,7 +268,8 @@ public async Task Http2_EmitsStartAndStopEventsWithActivityIds()
             Assert.Equal(eventIndex, events.Count);
         }
 
-        [Fact]
+        [ConditionalFact]
+        [MinimumOSVersion(OperatingSystems.Windows, WindowsVersions.Win8, SkipReason = "SslStream.AuthenticateAsServerAsync() doesn't throw on Win 7 when the client tries SSL 2.0.")]
         public async Task TlsHandshakeFailure_EmitsStartAndStopEventsWithActivityIds()
         {
             int port;
@@ -298,7 +299,7 @@ public async Task TlsHandshakeFailure_EmitsStartAndStopEventsWithActivityIds()
                 {
                     TargetHost = "localhost",
 
-                    // Only enabling SslProtocols.Ssl2 should cause a handshake failure on all platforms.
+                    // Only enabling SslProtocols.Ssl2 should cause a handshake failure on most platforms.
 #pragma warning disable CS0618 // Type or member is obsolete
                     EnabledSslProtocols = SslProtocols.Ssl2,
 #pragma warning restore CS0618 // Type or member is obsolete