Hide link checker fieldset in field creation / edit widget, if not supported

nilesh.addweb → made their first commit to this issue’s fork.

Hi,
I have created MR !85, Please review it.

Thanks @nilesh.addweb. Generally LGTM but tests are failing.

Thanks for reviewing. I’ve checked and fixed PHPCS issues related to this task; Need to create a separate issue for remaining PHPCS fixes. However, throughout PHPCS testing locally, I did not discover any other PHPCS issue.