Update universal listings & UI table unit tests to be more robust

[lb-]

Relates to #11717 - Ensure that tests checking for th/td scope the checks to specific tables

We have a few unit tests that are counting th/td but currently these are not scoped to specific tables in the HTML. This means that any shared addition of tables will break these tests.

I have scoped the selectors to the elements that are intended to be tested, also making these tests more robust with mapping to the id so we know where these elements should be contained.

[squash-labs]

Manage this branch in Squash

Test this branch here: https://lb-fixmore-robust-unit-tests-t-s7xtd.squash.io

[laymonage]

Thanks! This and #11725 are simple enough so I'll just merge via GitHub without release notes. Feel free to add release notes afterwards if you want, though.

[lb-]

Thanks @laymonage no need for a changelog for this and the other unit test. They are small changes that just help enable other items.