feat(newrelic-logging): add global.images.pullSecrets support to daemonset

Update imagePullSecrets rendering to cascade from global.images.pullSecrets:
- Updated daemonset.yaml imagePullSecrets to include global.images.pullSecrets
- Uses common library renderPullSecrets helper with concat
- Maintains compatibility with existing chart-level image.pullSecrets

Configuration hierarchy:
1. global.images.pullSecrets (applied first - highest priority)
2. image.pullSecrets (chart level - applied second)
Both sources are concatenated to support flexible secret management.

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

Author: dpacheconr

charts/newrelic-logging/templates/daemonset.yaml

@@ -39,7 +39,8 @@ spec:
       {{- end }}
       dnsPolicy: ClusterFirstWithHostNet
       terminationGracePeriodSeconds: 10
-      {{- with include "newrelic.common.images.renderPullSecrets" ( dict "pullSecrets" (list .Values.image.pullSecrets) "context" .) }}
+      {{- $globalPullSecrets := .Values.global.images.pullSecrets | default list }}
+      {{- with include "newrelic.common.images.renderPullSecrets" ( dict "pullSecrets" (concat $globalPullSecrets (list .Values.image.pullSecrets)) "context" .) }}
       imagePullSecrets:
         {{- . | nindent 8 }}
       {{- end }}