(CAT-2391) Puppetcore upgrade

A set of changes dedicated to implementing puppetcore into our modules.
This update, amongst other changes, removes Puppet 7 support.

Author: LukasAud

metadata.json

@@ -26,7 +26,7 @@
   "requirements": [
     {
       "name": "puppet",
-      "version_requirement": ">= 7.0.0 < 9.0.0"
+      "version_requirement": ">= 8.0.0 < 9.0.0"
     }
   ],
   "pdk-version": "3.2.0",