Some Docker for Windows tests are being skipped
Overview
In !2212 (merged) we are skipping tests that are failing on Windows, however we are also skipping tests that successfully run such as:
TestDockerCommandSuccessRunTestDockerCommandMultistepBuildTestDockerCommandSuccessRunRawVariableTestDockerCommandBuildFail
Also we removed all the known failed tests from ci/.test-failures.servercore1809.txt which should not be the case because that should be our SSOT of what the test failures are, even if we are skipping them.