fix: Adding a pagehide listener to cover bases when unload becomes deprecated

[cahirodoherty-learningpool]

Partly fixes FW3481

Fix

• Added a 'pagehide' listener to backup the soon-to-be-deprecated 'unload' event

[github-actions[bot]]

:tada: This PR is included in version 1.1.5 :tada:

The release is available on GitHub release

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