test: mark test-watch-mode* as flaky on all platforms

This was confirmed flaky on those platforms:
- Windows x64
- Windows on Arm
- Linux
- Freebsd

Tests randomly fail because of bad order in messages expected, which
seems related to threads scheduling at execution.

PR-URL: #45049
Backport-PR-URL: #44873
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/sequential/sequential.status

@@ -7,6 +7,9 @@ prefix sequential
 [true] # This section applies to all platforms
 # https://github.com/nodejs/node/issues/27611#issuecomment-613100468
 test-cpu-prof-dir-worker: PASS, FLAKY
+# https://github.com/nodejs/node/issues/44898
+test-watch-mode: PASS, FLAKY
+test-watch-mode-inspect: PASS, FLAKY
 
 [$system==win32]