Add filter to modify expiration time in entry moderation merge tag

[rafaehlers]

A user asked:

is it possible to remove the time limit for the merge tags links? So it should be available any time, not for 24h.

• If time-limited, make sure the maximum is 48 hours; that's all nonces can support.
• If time is empty (0), remove nonce and use other validation system

And there are no filters here: https://github.com/GravityKit/GravityView/blob/39726592410f8164f88a2ce2cbfdeb440fa15921/includes/class-gravityview-entry-approval-merge-tags.php#L34

Related:

• https://docs.gravitykit.com/article/904-entry-moderation-merge-tags
• https://github.com/GravityKit/GravityView/issues/1874

[zackkatz]

FreeScout #71831.
https://support.gravitykit.com/conversation/71831?folder_id=1

[rafaehlers]

Related: https://github.com/GravityKit/GravityView/issues/1986

[rafaehlers]

https://secure.helpscout.net/conversation/2748322719/58439