Werk #18677: add download button in the certificate overview

Component	Setup
Title	add download button in the certificate overview
Date	Sep 18, 2025
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

Certificate can now be downloaded from the certificate overview page.

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