fix(jsonschema): remove new lines from description

[lukidzi]

Kubebuilder 0.14 has introduced a change in how it handles new lines in field descriptions. Now, if there is a new line, it adds it to the object, causing rendering issues for the objects. I attempted to address this by utilizing the library option, but unfortunately, it is not supported (refer to https://github.com/showdownjs/showdown/issues/801).

As a workaround, I implemented a function that iterates over the object and removes new lines from the description field.

https://kuma.io/docs/2.6.x/policies/meshgatewayinstance/#schema https://deploy-preview-1632--kuma.netlify.app/docs/2.6.x/policies/meshgatewayinstance/#schema

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