test: Add Research Translation Loop starter template for FE testing

[Cristhianzl]

This pull request introduces a new integration test for the "Research Translation Loop" feature in the src/frontend/tests/core/integrations/Research Translation Loop.spec.ts file. The test ensures that the feature works correctly by simulating user interactions and checking the output.

Key changes include:

• Added necessary imports for testing and environment configuration.
• Implemented a test that skips execution if the ANTHROPIC_API_KEY environment variable is not set.
• Configured environment variables from a .env file when not running in CI.
• Simulated user interactions to navigate through the UI and perform actions related to the "Research Translation Loop" feature.
• Added assertions to verify that the output of the feature meets the expected criteria.