clean up: remove unused file

[yyzxw]

Does this PR introduce a user-facing change?

clean up useless files, it duplicates with https://github.com/containers/podman/blob/main/cmd/podman/diff/diff.go

[NO NEW TESTS NEEDED]

[giuseppe]

please add [NO NEW TESTS NEEDED] to the commit message

[rhatdan]

Thanks @yyzxw
Please repush your commit, I added [NO NEW TESTS NEEDED]

[mheon]

LGTM once re-pushed with no tests needed message.

[mheon]

/approve

[TomSweeneyRedHat]

LGTM
once the tests are hip

[yyzxw]

/retest

[openshift-ci]

@yyzxw: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[rhatdan]

You need to repush to trigger CI to see [NO NEW TESTS NEEDED] flag.

git commit -a --amend -s
git push --force

[yyzxw]

/retest

[openshift-ci]

@yyzxw: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[mheon]

Last test remaining is an allowed failure, this is good.

[mheon]

/lgtm
/approve

Thanks @yyzxw

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mheon, yyzxw

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