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

[TylerHelmuth]

          Should we use the already available internal [docker.ParseImageName](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/internal/common/docker/images.go#L23) function instead?

I would prefer to all components use the same strategy for common functionalities. Note that the shared function cannot parse images with digest at the moment and should be fixed beforehand: #36279

Originally posted by @rogercoll in #36145 (comment)

[github-actions]

Pinging code owners:

• processor/k8sattributes: @dmitryax @fatsheep9146 @TylerHelmuth

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[github-actions]

Pinging code owners for processor/k8sattributes: @dmitryax @fatsheep9146 @TylerHelmuth. See Adding Labels via Comments if you do not have permissions to add labels yourself. For example, comment '/label priority:p2 -needs-triaged' to set the priority and remove the needs-triaged label.

[ChrsMark]

We could also consider using the https://pkg.go.dev/github.com/distribution/reference#Reference package as it was mentioned at #36145 (comment) by @spiffyy99.

(already used at

opentelemetry-collector-contrib/processor/k8sattributesprocessor/internal/kube/client.go

Line 720 in 97659b5

if parsed, err := reference.ParseAnyReference(apiStatus.ImageID); err == nil {

)

[vordimous]

@TylerHelmuth I would like to take on this issue.

[vordimous]

I have made the changes to use the docker.ParseImageName function as well as updated the import name for the internal/docker package be uniform throughout the project.

The current test that the old method was supporting is failing due to the lack of image digest support: FAIL: internal/kube Test_extractPodContainersAttributes/image-name-only. I believe this is where we want to be given this PR is dependant on #36279 then the text should succeed once this PR is updated after it is merged.

@TylerHelmuth, do you want this PR to stay as a draft PR or mark it as ready with the known test failure?