When addGatewayClientOptions registers --url on the parent browser
command, Commander.js captures it before the cookies set subcommand
can receive it. Switch from requiredOption to option and resolve
via inheritOptionFromParent, matching the existing pattern used
for --target-id.
Fixes#24811
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
(cherry picked from commit 96fcb963ec6ef4254898aa2afa91d85b61ce677a)