feat: support chai in scripts

[pooja-bruno]

Description

This PR improves Bruno's testing features:

• Now supports tests in both pre-request and post-response scripts
• Added a dropdown in test results to easily switch between different test types
• Fixed Postman import to correctly place post scripts in the right location
• Improved test results display

Contribution Checklist:

• [x] The pull request only addresses one issue or adds one feature.
• [x] The pull request does not introduce any breaking changes
• [x] I have added screenshots or gifs to help explain the change if applicable.
• [x] I have read the contribution guidelines.
• [x] Create an issue and link to the pull request.