feat: Allow users to see heatmap for last 30 days (#10848)

<img width="989" alt="Screenshot 2025-02-05 at 6 34 12 PM"
src="https://github.com/user-attachments/assets/ae811842-23f7-4bbc-8a42-7cbe4849d287"
/>

View heatmaps for last 30 days based on the filter.

app/javascript/dashboard/api/reports.js

@@ -61,9 +61,9 @@ class ReportsAPI extends ApiClient {
     });
   }
 
-  getConversationTrafficCSV() {
+  getConversationTrafficCSV({ daysBefore = 6 } = {}) {
     return axios.get(`${this.url}/conversation_traffic`, {
-      params: { timezone_offset: getTimeOffset() },
+      params: { timezone_offset: getTimeOffset(), days_before: daysBefore },
     });
   }