Set up environment variables for testing configuration

- Added default values for REACT_APP_API_BASE_URL and REACT_APP_ENV in setupTests.ts to ensure consistent test environment.

Author: TsotneMikadze

src/setupTests.ts

@@ -3,4 +3,8 @@
 // expect(element).toHaveTextContent(/react/i)
 // learn more: https://github.com/testing-library/jest-dom
 import '@testing-library/jest-dom';
-import './__mocks__/resizeObserverMock';
+import './__mocks__/resizeObserverMock';
+
+// Set up environment variables for tests
+process.env.REACT_APP_API_BASE_URL = process.env.REACT_APP_API_BASE_URL || 'http://localhost:9811';
+process.env.REACT_APP_ENV = process.env.REACT_APP_ENV || 'local';