Werk #18072: Agent signature keys: Add expire date and time

Component	Setup
Title	Agent signature keys: Add expire date and time
Date	Jun 5, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.4.0p5 Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.3.0p35 Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p44 Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

The new column "Expires" now shows the date and time an agent signing key will expire.

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