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: nodejs/node#45049
Backport-PR-URL: nodejs/node#44873
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Moshe Atlow <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Darshan Sen <[email protected]>
Reviewed-By: James M Snell <[email protected]>

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]