Sanitize the url tag

[L3n41c]

What does this PR do?

Sanitise the url tag of the kubernetes.rest.client.latency metric of the kubelet check.

Motivation

The url tag of the kubernetes.rest.client.latency metric is causing some high cardinality issue.
In order to reduce the cardinality, we strip the url tag to keep only the path.

The url tag contains all the possible values for the Kubernetes API server calls made by the kubelet.
Ex.: https://35.242.243.158/api/v1/namespaces/%7Bnamespace%7D/configmaps?fieldSelector=%7Bvalue%7D&limit=%7Bvalue%7D&resourceVersion=%7Bvalue%7D

The host of the url is the Kubernetes API server.
Whereas it is the same for all the kubelet inside a cluster, it will be different in two different clusters.
Dropping the host part of the url will ease the comparison of kubernetes.rest.client.latency between different clusters.

Additional Notes

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 #11989 (941ef82) into master (792e0f4) will increase coverage by 0.00%.
The diff coverage is 87.50%.

Flag	Coverage Δ
kubelet	90.73% <87.50%> (+0.15%)	⬆️

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