Remove setBlocking calls and simplify file-redirect approach

Remove fragile process.stdout._handle.setBlocking calls from CLI test
commands. Revert the preload workaround in repo-tools since the root
cause is removed.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

packages/cli/src/modules/test/commands/package/test.ts

@@ -87,11 +87,6 @@ export default async (_opts: OptionValues, cmd: Command) => {
     }--no-node-snapshot`;
   }
 
-  // This ensures that the process doesn't exit too early before stdout is flushed
-  if (args.includes('--help')) {
-    (process.stdout as any)._handle.setBlocking(true);
-  }
-
   // Because of the ongoing migration to v30 of jest, jest is no longer hard-depended to allow
   // opt-in migration. Users instead need to add jest as a devDependency themselves and specify
   // the version they want. This prints a helpful error message if jest is not found, i.e. they

packages/cli/src/modules/test/commands/repo/test.ts

@@ -304,11 +304,9 @@ export async function command(opts: OptionValues, cmd: Command): Promise<void> {
     }--no-node-snapshot`;
   }
 
-  // This ensures that the process doesn't exit too early before stdout is flushed
   if (args.includes('--jest-help')) {
     removeOptionArg(args, '--jest-help');
     args.push('--help');
-    (process.stdout as any)._handle.setBlocking(true);
   }
 
   // This code path is enabled by the --successCache flag, which is specific to