Cherry-pick #5084 to 6.0: Keep docker & k8s pod annotations while they are needed #5133
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Cherry-pick of PR #5084 to 6.0 branch. Original message:
In some cases pod annotations are neede after the container/pod is deleted, for
instance when filebeat is reading the log behind the container.
This change makes sure we keep metadata after a pod is gone. By storing
access times we ensure that it's available as long as it's being used
fixes #4986