[WIP] Popups triggered during a test execution are not isolated between sequentially executed tests, leading to state leakage

[Copilot]

• Analyze the popup isolation issue in CodeceptJS
• Understand the root cause: global popupStore state persistence between tests
• Create test to demonstrate the issue
• Implement minimal fix: clear popupStore in _after method for Playwright helper
• Implement minimal fix: clear popupStore in _after method for Puppeteer helper
• Test the fix works properly with comprehensive simulation tests
• Verify existing tests still pass and code passes linting

Summary

Fixed popup state leakage between sequentially executed tests in both Playwright and Puppeteer helpers.

Root Cause: The popupStore is a global singleton that was never cleared between tests, causing the Popup class setter to ignore new popups when one already existed.

Fix: Added popupStore.clear() call in the _after() method of both helpers to ensure clean popup state between tests.

Changes Made:

• lib/helper/Playwright.js: Added popup state clearing in _after() method (3 lines added)
• lib/helper/Puppeteer.js: Added popup state clearing in _after() method (3 lines added)

The fix is minimal, surgical, and preserves all existing functionality while preventing popup state leakage between tests.

Fixes #4971.

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