Feature - Radar Chart - Need to show custom tooltip only for actual index

[gowthamzinc]

What problem does this feature solve?

Radar Chart Existing tooltip

What does the proposed API look like?

Expected tooltip on Hover

Expected data on click

[echarts-bot[bot]]

To reviewers: If this PR is going to be described in the changelog in the future release, please make sure this PR has one of the following labels: PR: doc ready, PR: awaiting doc, PR: doc unchanged

This message is shown because the PR description doesn't contain the document related template.

[gowthamzinc]

Please don't include code else than src and test.

Removed code else than src and test.

[gowthamzinc]

@Ovilia just a gentle reminder — I’ve already re-requested your review after addressing the changes. Could you please take another look when you have a moment? 🙏