feat: increase mobile devices emulate

[openmind-why]

Hello, my website is a mobile SSR project. When I was using MCP to check website performance, I found that I couldn't set mobile UA, which triggered my server PC UA redirection rule. Therefore, I think it is necessary to add this feature to provide the ability to check mobile projects

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[OrKoN]

Thanks for the PR! We will review it soon after we discuss if this is the way we want to expose the emulation options.