Fix CI failures: replace [Basic] test job with scenario-based jobs; add PSAvoidUsingWriteHost exclusion; suppress publishModule unused-var warning

Author: MariusStorhaug

.github/linters/.powershell-psscriptanalyzer.psd1

@@ -50,6 +50,7 @@
         }
     }
     ExcludeRules = @(
+        'PSAvoidUsingWriteHost',        # Write-Host is acceptable in GitHub Actions runners.
         'PSMissingModuleManifestField', # This rule is not applicable until the module is built.
         'PSUseToExportFieldsInManifest'
     )