Remove fetchFinancialData function and related interface; add getProjectUnits function for weekly financial reports

- Deleted `fetchFinancialData.ts` which contained the financial data fetching logic.
- Introduced `getProjectUnits.ts` to fetch project units and write the results to a JSON file.
- Updated `index.ts` files to export new functionalities for better modularity.

These changes streamline the financial data handling and enhance the reporting capabilities for weekly financial reports.

Author: anatolyshipitz

workers/main/src/activities/fetchFinancialData.ts

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+export * from './weeklyFinancialReports';

workers/main/src/activities/index.ts

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+import { writeJsonFile } from '../../common/fileUtils';
+import {TargetUnitRepository} from "../../services/TargetUnit/TargetUnitRepository";
+import {RedminePool} from "../../common/RedminePool";
+import {redmineDatabaseConfig} from "../../configs/redmineDatabase";
+
+
+export const getProjectUnits = async () => {
+  const pool = new RedminePool(redmineDatabaseConfig).getPool();
+  const repo = new TargetUnitRepository(pool);
+  const result = await repo.getTargetUnits();
+  const filename = `data/weeklyFinancialReportsWorkflow/getProjectUnits/project-units-${Date.now()}.json`;
+
+  await writeJsonFile(filename, result);
+
+  return {
+    fileLink: `${filename}`,
+  };
+};

workers/main/src/activities/weeklyFinancialReports/getProjectUnits.ts

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+export * from './getProjectUnits';