Remove deprecated http_request and http_respsone fields from Kube-proxy dataset #4580

As per sdh https://github.com/elastic/sdh-beats/issues/2709, Prometheus http request meta-metrics have been depricated.

Full list of unsupported metrics currently are:

• http_request_duration_microseconds
• http_request_duration_microseconds_sum
• http_request_duration_microseconds_count
• http_request_size_bytes
• http_request_size_bytes_sum
• http_request_size_bytes_count
• http_requests_total,
• http_response_size_bytes
• http_response_size_bytes_sum
• http_response_size_bytes_count

Related links:
We have already done relevant work on 87a87e5

Goal:

• The kube-proxy dataset needs to be updated with reference of correct metrics
• Doc updates for correct metrics
• Promote new version of kubernetes integration to production