[WIP] Add emulate focused page feature for debugging Code OSS

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Make it easy to use Emulate a focused page when debugging Code OSS</issue_title>
<issue_description>This is a very powerful feature, which allows to debug several focus-related issues:

It would be very useful to have this surfaced in the VS Code JS debugger somehow.
</issue_description>

<agent_instructions>Let's have it both as a command and in the "Event Listener Breakpoint" title contribution alongside "Toggle Event Listener" breakpoints. It should also be registered in the command palette and have a Like Event Listener Breakpoints. You will need to create a new custom DAP method for this and call npx tsx src/build/generateDap.ts to regen the DAP typings.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Make it easy to use Emulate a focused page when debugging Code OSS vscode#283011

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