fix: add headlamp-argocd-plugin to ci-health-check.sh (#114)

Strip broken fetch_plugin_repos function (Nancy's QA review identified:
- wrong API endpoint / repos/privilegedescalation returns 404
- broken --jq/--arg invocation
- missing --paginate
- unanchored regex
- non-plugin filter missing
- dead code: defined but never called)

Follow-up for proper dynamic discovery tracked in PRI-256 follow-up.

Co-authored-by: Chris Farhood <chris@farhood.org>

.github/scripts/ci-health-check.sh

@@ -5,6 +5,7 @@
 set -euo pipefail
 
 ORG="privilegedescalation"
+
 PLUGIN_REPOS=(
   headlamp-polaris-plugin
   headlamp-rook-plugin
@@ -12,6 +13,7 @@ PLUGIN_REPOS=(
   headlamp-intel-gpu-plugin
   headlamp-tns-csi-plugin
   headlamp-kube-vip-plugin
+  headlamp-argocd-plugin
   headlamp-plugin-template
 )