Attempt to move large parts of LinkFieldTest to a kernel test

Problem/Motivation

LinkFieldTest::testLinkFormatterQueryParametersDuplication doesn't make any HTTP requests so could possibly be a Kernel test.
It has some shared code with other methods in that test so it will require some unpicking

Proposed resolution

Try to move ::testLinkFormatterQueryParametersDuplication to a Kernel test

Merge request link

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet