fix: Prevent orphan alert when duplicating dashboard tiles (#1655)

Closes HDX-3270

# Summary

This PR fixes a bug which caused duplicate, orphaned alerts to be created when duplicating a dashboard tile with an alert.

.changeset/stale-rules-hide.md

@@ -0,0 +1,5 @@
+---
+"@hyperdx/app": patch
+---
+
+fix: Prevent orphan alert when duplicating dashboard tiles

packages/app/src/DBDashboardPage.tsx

@@ -861,6 +861,11 @@ function DBDashboardPage({ presetConfig }: { presetConfig?: Dashboard }) {
                     {
                       ...chart,
                       id: makeId(),
+                      config: {
+                        ...chart.config,
+                        // Don't duplicate any alerts that may be set on the original tile
+                        alert: undefined,
+                      },
                     },
                   ],
                 });