test: mark test-bindings and test-debug-end flaky

PR-URL: https://github.com/nodejs/node/pull/15747
Refs: https://github.com/nodejs/node/issues/15558
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>

test/inspector/inspector.status

@@ -10,5 +10,7 @@ prefix inspector
 test-stop-profile-after-done: PASS, FLAKY
 
 [$system==win32]
+test-bindings               : PASS, FLAKY
+test-debug-end              : PASS, FLAKY
 test-stop-profile-after-done: PASS, FLAKY