fix: replace private image parse for common implementation

[vordimous]

Description

Replaces the private image parse method with the public common/docker image parse method.

Link to tracking issue

Fixes

• [processor/k8sattributes] Use the already available internal docker.ParseImageName function #36418

Blocked by

• [receiver/k8scluster] Invalid image name and tag attributes when containing a digest #36279

Testing

the existing test Test_extractPodContainersAttributes is used to verify behavior remained the same