Merge branch 'fj-33693-remove-system-silent-method' into 'master'

Remove `Gitlab::Utils.system_silent` method

Closes #33693

See merge request gitlab-org/gitlab!18321

lib/gitlab/utils.rb

@@ -13,14 +13,6 @@ module Gitlab
       path
     end
 
-    # Run system command without outputting to stdout.
-    #
-    # @param  cmd [Array<String>]
-    # @return [Boolean]
-    def system_silent(cmd)
-      Popen.popen(cmd).last.zero?
-    end
-
     def force_utf8(str)
       str.dup.force_encoding(Encoding::UTF_8)
     end