Fix remove_overlay_elements functionality by calling injected JS function.

[SohamKukreti]

Summary

• Fix critical bug where overlay removal JS function was injected but never called
• Change remove_overlay_elements() to properly execute the injected async function
• Wrap JS execution in async to handle the async overlay removal logic
• Add test_remove_overlay_elements() test case to verify functionality works
• Ensure overlay elements (cookie banners, popups, modals) are actually removed

The remove_overlay_elements feature now works as intended:

• Before: Function definition injected but never executed (silent failure)
• After: Function injected and called, successfully removing overlay elements

Fixes #1396

List of files changed and why

async_crawler_strategy.py: To implement the fix by calling the injecting js code.
tests/test_async_crawler_strategy.py: To test the remove_overlay_elements functionality.

How Has This Been Tested?

• Ran tests/test_async_crawler_strategy.py.
• Tested on websites with cookie popups.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added/updated unit tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/remove_overlay_elements

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