Fix reprocessElementsAssociatedWithIframe throwing an DOMException error

[mariyanbitsov-af]

Purpose

This pr fixes a bug with the processing of elements associated with Iframe. When the iframe name contains special characters, the querySelector method throws an exception and removes all the elements on the page.

Approach

The fix try catches the querySelectorAll method, in order to prevent exceptions that will remove all elements on the page. This way the expected behaviour is preserved

References

DevExpress/testcafe#7807

Pre-Merge TODO

• Write tests for your proposed changes
• Make sure that existing tests do not fail

[AlexKamaev]

Hello. Thank you for your contribution.
We believe that wrapping the problematic code in a try/catch block is not the best option in this case. We would like to fix the cause of the issue. First of all, please try to escape special characters in a css string. You can use the following function: https://developer.mozilla.org/en-US/docs/Web/API/CSS/escape_static
Also, please do not add unnecessary changes like imports.
In addition, please add a test for the fixed behavior.

[AlexKamaev]

I closed this PR since there has been no activity for a long time