fix(sources): fallback to file path metadata when pod annotation fails in kubernetes_logs

[vparfonov]

When the kubernetes_logs source fails to annotate an event with pod metadata (e.g. pod already deleted before Vector could look it up), the event is sent downstream with no kubernetes metadata at all.

This causes issues in downstream transforms that expect fields like namespace_name to be present.

The file path (/var/log/pods/<ns>_<pod>_<uid>/<container>/<n>.log) always contains the basic metadata. This change makes the annotator fall back to populating pod_name, pod_namespace, pod_uid and container_name from the parsed file path when the pod is not found in the API store, instead of returning None and skipping all enrichment.

JIRA: https://redhat.atlassian.net/browse/LOG-9584

/cc @Clee2691
/assign @jcantrill

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This pull-request has been approved by: vparfonov
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