chore: Hint at restart buffer in too short cert lifetime error message

[sbernauer]

https://stackable-workspace.slack.com/archives/C031NP72H7T/p1786970041382169

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[NickLarsenNZ]

LGTM

Would be cool if it was automatic, but this helps.

[soenkeliebau]

I think it makes sense to not have this automatic fwiw. Its a "soft but firm" recommendation against very short cert lifetimes, and having to tweak that parameter maybe makes users think about if they really want this :)