[pgAdmin4][runtime]: RM #2328 - Unable to launch query tool and debugger in new browser tab

Hi,

Please find attached patch file with the fix of RM #2328 - [Runtime]:
Unable to launch query tool and debugger in new browser tab.

I have used Qt 5.8 with webkit mentioned in below URL.

https://github.com/annulen/webkit/releases

As there was a bug in QWebKit regarding "unload" event. We have raised and
also they have provided patch file to fix this issue. I have applied the
patch in linux and compile the webkit and tested the attached patch with
compiled webkit which is now working fine.

Below is the link for reference regarding unload issue. They have provided
test webkit release for Mac in below URL but for other platform we need to
apply the patch and compile the webkit until they provide webkit-releases
for all platforms.

https://github.com/annulen/webkit/issues/519

Do review it and let me know in case of any issue.

Thanks,
Neel Patel