Understand/fix any implications of unload event deprecation within Chrome

[jennifer-shehane]

What would you like?

https://developer.chrome.com/docs/web-platform/deprecating-unload

Chrome is deprecating the upload event where it will begin ceasing to functions for some websites starting Q3 2024.

We should enable the flags to turn it off to understand the implications of the deprecation. https://github.com/fergald/docs/blob/master/explainers/permissions-policy-deprecate-unload.md#testing-with-chrome

We'll also need to handle users that have this flag manually turned on past the deprecation.

I opened a PR to deprecate the unload event to see what would fail here: #29242

Why is this needed?

No response

Other

No response

[cacieprins]

Next step: Determine if pagehide event will suffice for a replacement event

[cypress-bot]

Released in 13.11.0.

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