Restore full Grafana version matrix for e2e

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Platane

.github/workflows/ci.yml

@@ -89,9 +89,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        GRAFANA_IMAGE:
-          - name: grafana-oss
-            version: '12.4.0'
+        GRAFANA_IMAGE: ${{ fromJson(needs.build.outputs.e2e-matrix) }}
         QUICKWIT_VERSION: [edge]
     steps:
       - uses: actions/checkout@v6