scripts: publish unified Agent artifacts and restore CI coverage [CI]

Remove Probe build jobs and release paths. Transfer Gitea publishing credentials to both Agent architecture jobs, publish each platform archive once, and run slow tests after development images are published.

ci/publish-dev-node-index.sh

@@ -1,10 +1,10 @@
 #!/usr/bin/env bash
-# Publish the pullable multi-architecture development tags for Agent or Probe.
+# Publish the pullable multi-architecture development tags for Agent.
 set -euo pipefail
 
-component="${1:?usage: publish-dev-node-index.sh <agent|probe>}"
+component="${1:?usage: publish-dev-node-index.sh <agent>}"
 case "$component" in
-  agent|probe) ;;
+  agent) ;;
   *) echo "unsupported component: $component" >&2; exit 2 ;;
 esac
 [[ "${CI_PIPELINE_EVENT:-}" == push && "${CI_COMMIT_BRANCH:-}" == main && "${CI_COMMIT_MESSAGE:-}" == *"[CI]"* ]] || {