Add preliminary UI tests

[olaservo]

This PR adds configuration for adding UI tests as well as a few preliminary tests related to recent issues in this repo.

Motivation and Context

Manually testing UI inputs isn't really feasible for reproducing issues and avoiding new bugs, especially related to UI components that have many dynamic input fields.

How Has This Been Tested?

Tests are run automatically in the GitHub actions.

Breaking Changes

None

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

[olaservo]

Added a purposely failing test related to this PR: #206
Will update this branch once that is merged.

[jspahrsummers]