`gw-disable-expired-forms.php`: Added snippet to disable expired forms.

[saifsultanc]

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Context

⛑️ Ticket(s): https://secure.helpscout.net/conversation/2696916682/70897

Summary

A snippet that checks on load if the scheduled end date is beyond a given range and if so, updates the form status to "inactive". This checks all forms globally on load but only apply if a form schedule end date is set and that date is beyond a threshold value.

Snippet Demo: https://www.loom.com/share/e2eff9a9b4744f1eb9fc8e1f2e8fd1cb