feat(project-finance): add finance data export functionality

- Implemented a new endpoint in the project finance controller to export financial data as an Excel file, allowing users to download project finance details.
- Enhanced the frontend to include an export button that triggers the finance data export, with appropriate loading states and error handling.
- Added functionality to group exported data by status, priority, or phases, improving the usability of the exported reports.
- Updated the project finance API service to handle the export request and return the generated Excel file as a Blob.

worklenz-frontend/src/api/project-finance-ratecard/project-finance.api.service.ts

@@ -49,4 +49,18 @@ export const projectFinanceApiService = {
         );
         return response.data;
       },
+
+    exportFinanceData: async (
+        projectId: string,
+        groupBy: 'status' | 'priority' | 'phases' = 'status'
+      ): Promise<Blob> => {
+        const response = await apiClient.get(
+          `${rootUrl}/project/${projectId}/export`,
+          {
+            params: { groupBy },
+            responseType: 'blob'
+          }
+        );
+        return response.data;
+      },
 }