dev-server-core/WebSocketsManager: send periodic ping over WebSockets to prevent connection closure for inactivity

[larabr]

What I did

1. Added pinging mechanism over the web sockets to prevent unexpected connection closure after ~60s (with websocket error 1006) when testing on BrowserStack (Safari).

I couldn't get to the bottom of what exactly is causing the timeout, but sending periodic ping messages fixes it. I checked if the ws server is closing the connection, but it doesn't seem to be the case; using a ping to keep the connection alive is suggested here.

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[bashmish]

Tricky one, I would love to have a stable solution for BrowserStack, many times my tests just randomly failed with timeouts in Firefox and Safari on BrowserStack.

However do you think it's a generic issue with WS or is it due to BrowserStack? If the latter, it would be better to implement this in the BrowserStack adapter

[larabr]

In this case I think it might be due to the Browserstack testing setup, because I couldn't repro with Playwright in local, but I'm not sure if it's a problem unique to the platform: based on other issues I've found around (incl. the one I linked), other network setups might be affected as well.

Edit: the Browserstack support team shared that they use mitmproxy to enable network logs on their side, so the inactivity timeout might come from there.