[8.x](backport #5990) [Kubernetes provider]Update kubernetes provider README #6125
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What does this PR do?
This PR updates the README of Kubernetes Provider. It was created years ago and is out of date. It includes high level information and configuration options of Kubernetes Provider.
Why is it important?
The information provided in the README are out of date and can confuse a lot of readers.
Checklist
./changelog/fragments
using the changelog toolThis is an automatic backport of pull request #5990 done by [Mergify](https://mergify.com).