Base: Disable TestLibCoreStream in run-tests for now

This test is very flaky, so let's turn it off until someone fixes it.

Base/home/anon/.config/Tests.ini

@@ -1,7 +1,7 @@
 [Global]
 SkipDirectories=Kernel/Legacy
 SkipRegex=^ue-.*$
-SkipTests=test-web TestCommonmark
+SkipTests=test-web TestCommonmark TestLibCoreStream
 NotTestsPattern=^.*(txt|frm|inc)$
 
 [test-js]