Merge pull request #443 from puppetlabs/PE_38709_excludeCentOs8Tests

Remove EOL CentOs-7 and CentOs-8  from metadata.json and update tests

Author: cathal41

.github/workflows/test-install-matrix.yaml

@@ -46,7 +46,6 @@ jobs:
           - 2021.7.8
           - 2023.7.0
         image:
-          - centos-7
           - almalinux-cloud/almalinux-8
     steps:
       - name: "Checkout Source"

metadata.json

@@ -66,13 +66,6 @@
         "9"
       ]
     },
-    {
-      "operatingsystem": "CentOS",
-      "operatingsystemrelease": [
-        "7",
-        "8"
-      ]
-    },
     {
       "operatingsystem": "Ubuntu",
       "operatingsystemrelease": [