Use container input in container_logs datastream input of k8s package

[ChrsMark]

Currently we use logfile input to parse k8s' container logs. A more complete approach would be to use container input which is support by Agent at https://github.com/elastic/beats/blob/5ae6d63969c872e6229f271907a732d2ddc532dc/x-pack/elastic-agent/spec/filebeat.yml#L53.

Standalone manifest would need a tuning too.

[ChrsMark]

cc: @mukeshelastic @akshay-saraswat @MichaelKatsoulis

[MichaelKatsoulis]

@ChrsMark there is also this issue suggesting to move to filestream input for container logs

[ChrsMark]

Cool! These two are tightly coupled, we can evaluate both options but I would say that using filestream input should be preferred?

[MichaelKatsoulis]

Yes it seems the newest way to read log lines and we will use container parser.