remove unused rules in ant-vars.less

[interim17]

Time estimate or Size

tiny

Problem/Solution

There are a number of outdated style rules in the ant-vars.less file that seem like they can be removed.

Eventually we will move away form using LESS when we update the antd dependency, and the content of these rules is outdated as most commits are 4+ years old.

[github-actions[bot]]

Coverage report

St.:grey_question:	Category	Percentage	Covered / Total
🟡	Statements	66.67%	664/996
🟡	Branches	66.21%	96/145
🔴	Functions	35.83%	91/254
🟡	Lines	64.91%	590/909

Test suite run success

121 tests passing in 7 suites.

Report generated by 🧪jest coverage report action from da06470c0996a54d78393ce0d5a82e7f61bd29a4