Werk #15874: Speed up "Extension packages" pages

Component	Setup
Title	Speed up "Extension packages" pages
Date	Oct 19, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p13 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

The pages of the "Extension packages" manager where loading slowly for sites with many local files.

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