src: remove --harmony-import-attributes

Import attributes have been enabled by default since V8 M123 and are now
standard in JavaScript. Remove the hardcoded injection of the flag in
Node.js so that the flag can be deprecated and removed upstream in V8.

Refs: https://chromium-review.googlesource.com/c/v8/v8/+/8260695
Signed-off-by: Olivier Flückiger <olivf@chromium.org>
PR-URL: #65396
Refs: #61898
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Richard Lau <richard.lau@ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: o-

src/node.cc

@@ -759,13 +759,6 @@ static ExitCode ProcessGlobalArgsInternal(std::vector<std::string>* args,
     return ExitCode::kInvalidCommandLineArgument2;
   }
 
-  // TODO(aduh95): remove this when the harmony-import-attributes flag
-  // is removed in V8.
-  if (std::ranges::find(v8_args, "--no-harmony-import-attributes") ==
-      v8_args.end()) {
-    v8_args.emplace_back("--harmony-import-attributes");
-  }
-
   if (!per_process::cli_options->per_isolate->max_old_space_size_percentage
            .empty()) {
     v8_args.emplace_back(