RI-6570 Configure code coverage reports for the playwright e2e tests

[valkirilov]

Description

Integrating NYC (Istanbul) code coverage collection into our Playwright E2E test suite, enabling automatic frontend code coverage reporting during test execution.

• extended Playwright fixtures to automatically collect Istanbul coverage data after each test
• added NYC configuration to properly process and report coverage for the UI source code
• enhanced package.json scripts with coverage-specific commands for running tests and generating reports

How to Use

Running Tests with Coverage

# Start the UI server with coverage instrumentation
yarn dev:ui:coverage

# In another terminal, run tests with coverage collection
cd tests/playwright
yarn test:coverage

Viewing Coverage Reports

After running tests with coverage, reports are generated in tests/playwright/coverage/:

• HTML Report: Open coverage/index.html in your browser for an interactive coverage explorer
• LCOV Report: coverage/lcov.info for CI/CD integration (Codecov, etc.)
• Console Output: Text-based coverage summary displayed during test execution

[github-actions]

Code Coverage - Frontend unit tests

St.❔	Category	Percentage	Covered / Total
🟢	Statements	81.37%	18403/22616
🟡	Branches	67%	8068/12042
🟡	Functions	75.14%	4867/6477
🟢	Lines	81.76%	18006/22024

Test suite run success

4792 tests passing in 628 suites.

Report generated by 🧪jest coverage report action from 687d9b1