test: unskip copyfile permission test

This is no longer a flakey test, and should run everywhere.

Backport-PR-URL: #27776
PR-URL: #27241
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

Author: cjihrig

test/known_issues/known_issues.status

@@ -7,25 +7,19 @@ prefix known_issues
 [true] # This section applies to all platforms
 
 [$system==win32]
-test-fs-copyfile-respect-permissions: SKIP
 
 [$system==linux]
 test-vm-timeout-escape-nexttick: PASS,FLAKY
 test-vm-timeout-escape-promise: PASS,FLAKY
-test-fs-copyfile-respect-permissions: SKIP
 
 [$system==macos]
 
 [$system==solaris]
-test-fs-copyfile-respect-permissions: SKIP
 
 [$system==freebsd]
-test-fs-copyfile-respect-permissions: SKIP
 
 [$system==aix]
-test-fs-copyfile-respect-permissions: SKIP
 
 [$arch==arm]
 # https://github.com/nodejs/node/issues/24120
 test-vm-timeout-escape-nexttick: PASS,FLAKY
-test-fs-copyfile-respect-permissions: SKIP