Split-GPG: consider making GPG keys access never expire

[deeplow]

The following prompt appears when sd-app is first start:

If the user clicks No this could lead for an unusable workstation (at least until sd-app restart) and I think it doesn't add anything from the security perspective since the user is always expected to say Yes.

This was set to 8 hours in 2018 and has stayed like that since then, my suggestion would be to reconsider if this choice still makes sense from the UX and security perspectives.

[deeplow]

I'll be making a PR for this so this never pops up again for users 🤩

[deeplow]

This will have implications for #1265, but we'll probably merge this one first and think about the other afterwards.