Document new time picker in logs page changes and dashboard

Goal

Update documentation at

• Time picker in logs https://docs.gitlab.com/ee/user/project/clusters/kubernetes_pod_logs.html
• Time range in links https://docs.gitlab.com/ee/user/project/integrations/prometheus.html#downloading-data-as-csv

Original conversation

The following discussion from !23837 (merged) should be addressed:

• @mrincon started a discussion: (+1 comment)

  The documentation should be updated with the dates selection and a new screenshot.