test: mark test-worker-http2-stream-terminate flaky on Windows

The test is causing a lot of CI failures, so I'd say that we should mark
this test flaky until someone comes up with a proper fix.

Refs: #43084
Signed-off-by: Darshan Sen <raisinten@gmail.com>

PR-URL: #43425
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

test/parallel/parallel.status

@@ -15,6 +15,8 @@ test-timers-immediate-queue: PASS,FLAKY
 test-crypto-keygen: PASS,FLAKY
 # https://github.com/nodejs/node/issues/41201
 test-fs-rmdir-recursive: PASS, FLAKY
+# https://github.com/nodejs/node/issues/43084
+test-worker-http2-stream-terminate: PASS, FLAKY
 
 [$system==linux]
 # https://github.com/nodejs/node/issues/39368