test: remove flaky designation for test

Unreliability for test-trace-events-fs-sync is believed to have been
fixed. Remove flaky designation.

Ref: #22812
Ref: #21038 (comment)

PR-URL: #22856
Refs: #22812
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Yuta Hiroto <hello@hiroppy.me>
Reviewed-By: Refael Ackermann <refack@gmail.com>

Author: Trott

test/parallel/parallel.status

@@ -5,8 +5,6 @@ prefix parallel
 # sample-test                        : PASS,FLAKY
 
 [true] # This section applies to all platforms
-# https://github.com/nodejs/node/issues/22865
-test-trace-events-fs-sync: PASS,FLAKY
 # https://github.com/nodejs/node/issues/23207
 test-net-connect-options-port: PASS,FLAKY