Add service check for K8s API Server components

[juliogreff]

What does this PR do?

Adds kube_scheduler.up and kube_controller_manager.up service checks
for the Kube Scheduler and Kube Controller Manager, respectively. This
is to support the deprecation of some of the
kube_apiserver_controlplane.up service checks backed by the
ComponentStatus API. See
DataDog/datadog-agent#8577 for more context.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have changelog/ and integration/ labels attached

[codecov]

Codecov Report

Merging #9773 (3584f2c) into master (f2f285e) will increase coverage by 0.00%.
The diff coverage is 93.58%.

❗ Current head 3584f2c differs from pull request most recent head 8d5825b. Consider uploading reports for the commit 8d5825b to get more accurate results
| Flag | Coverage Δ | |
|---|---|---|
| kube_controller_manager | 97.14% <97.43%> (+0.08%) | ⬆️ |
| kube_scheduler | 96.41% <89.74%> (-1.67%) | ⬇️ |

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