feat(project-finance): add billable filter functionality to project finance queries

- Introduced a `billable_filter` query parameter to filter tasks based on their billable status (billable, non-billable, or all).
- Updated the project finance controller to construct SQL queries with billable conditions based on the filter.
- Enhanced the frontend components to support billable filtering in project finance views and exports.
- Added corresponding translations for filter options in multiple languages.
- Refactored related API services to accommodate the new filtering logic.

worklenz-frontend/public/locales/en/project-view-finance.json

@@ -8,12 +8,16 @@
     "exportButton": "Export",
     "currencyText": "Currency",
     "importButton": "Import",
+    "filterText": "Filter",
+    "billableOnlyText": "Billable Only",
+    "nonBillableOnlyText": "Non-Billable Only",
+    "allTasksText": "All Tasks",
   
     "taskColumn": "Task",
     "membersColumn": "Members",
     "hoursColumn": "Estimated Hours",
     "totalTimeLoggedColumn": "Total Time Logged",
-    "costColumn": "Cost",
+    "costColumn": "Actual Cost",
     "estimatedCostColumn": "Estimated Cost",
     "fixedCostColumn": "Fixed Cost",
     "totalBudgetedCostColumn": "Total Budgeted Cost",