Skip py.exe launcher tests in full layout CI test (GH-100948)


These tests become flaky when py.exe exists on the test machine but isn't the one that was just built. They also don't provide any useful information for this scenario, so easiest to just skip them.
(cherry picked from commit 5ff029f7a30705ac00a1010d3d191edcd011f160)

Co-authored-by: Steve Dower <steve.dower@python.org>
1 file changed