[WIP] CodeceptJS 3.7.x: "tryTo" and "session" do not work together

[Copilot]

• Analyze the repository structure and understand the issue
• Identify the problem: both tryTo and session use recorder.session.start() but the session management doesn't support nesting
• Root cause: sessionId is a single variable that gets overwritten when nested sessions start
• Created test case that reproduces the hanging behavior
• Implement stack-based session management to support nested sessions
• Update session start/restore methods to handle session stack properly
• Add integration tests demonstrating tryTo inside session and session inside tryTo work
• Ensure all existing tests still pass
• Verify the fix resolves the hanging issue with real integration tests

Key Changes:

• Added sessionStack array to track nested sessions in lib/recorder.js
• Modified recorder.session.start() to push current session to stack instead of restoring it immediately
• Modified recorder.session.restore() to pop parent session from stack when available
• Updated reset() method to clear the session stack
• Added integration test scenarios in session test file demonstrating both nesting directions work

The fix enables proper nesting of effects that use recorder sessions, resolving the hanging issue when tryTo is used inside session().

Fixes #5116.

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