Add process_cpu_seconds_total to kube_apiserver_metrics check

[justin-lesko]

What does this PR do?

This PR adds process_cpu_seconds_total to the list of metrics collected by the kube_apiserver_metrics check and remaps it to process_cpu_total

Motivation

GitHub issue: #18219

QA

Tested with a custom built datadog-agent container that includes this change.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[sblumenthal]

Change looks good, but please add the new metric to the metadata.csv file somewhere

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.52%. Comparing base (bef0a2f) to head (40c286b).
Report is 4 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
activemq	?
cassandra	?
jboss_wildfly	?
kafka	?
kube_apiserver_metrics	97.75% <ø> (ø)
presto	?
weblogic	?

Flags with carried forward coverage won't be shown. Click here to find out more.

[clamoriniere]

small nits on the metrics name remapping.
also can be good to add the metrics to the Out of the box dashboard https://github.com/DataDog/integrations-core/blob/master/kube_apiserver_metrics/assets/dashboards/overview.json
(can be done in a next PR)