RTC: Increase awareness timeout to avoid false disconnects

[shekharnwagh]

Backport for awareness timeout update from Gutenberg PR - WordPress/gutenberg#76065

Trac: https://core.trac.wordpress.org/ticket/64622

The 30 s awareness timeout matched the background-tab polling interval exactly, causing awareness entries to expire between polls and triggering false "X has left" notifications that resolved on the next poll cycle.

Increase to 70 s to comfortably exceed the polling interval. The value accounts for Chrome's intensive throttling which can delay background tab timers to ~60 s

[github-actions]

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[github-actions]

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[github-actions]

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[shekharnwagh]

This is no longer required. We went with adjusting the polling interval when tab is in background which does not require backport PR - WordPress/gutenberg@9daebb6