fix height of full-width Metrics charts

trigger layout update after first draw(), as they are first rendered at
450px width (from CSS), then update to 100% once they have paths added

app/assets/javascripts/monitoring/components/dashboard.vue

@@ -147,6 +147,7 @@ export default {
           }
           this.showEmptyState = false;
         })
+        .then(this.resize)
         .catch(() => {
           this.state = 'unableToConnect';
         });

changelogs/unreleased/48419-charts-with-long-label-appear-oversized.yml

+---
+title: fix height of full-width Metrics charts on large screens
+merge_request: 20866
+author:
+type: fixed