[DevTools 99] Network: WebSocket throttling

[sofiayem]

Fixes #2520
Fixed #2527

• Updated the throttling section, "offline" is now in the dropdown menu, it's not a checkbox. Also, there was no description of custom throttling profiles.
• Added "Throttle WebSocket connections" from 99: https://developer.chrome.com/blog/new-in-devtools-99/#websocket

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[jecfish]

LGTM. Minor nit on the name. Please update as well if any other places use tab instead of panel.

Thanks Sofia!

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