[Bug]: TestCLIImages current download tests break other image tests.

[jglogan]

I have done the following

• I have searched the existing issues
• If possible, I've reproduced the issue using the 'main' branch of this project

Steps to reproduce

The test for concurrent downloads removes the ghcr.io/linuxcontainers/alpine:3.20 in between pulls with different concurrency values.

This will cause other image tests to randomly fail as they are also trying to work with this image.

Current behavior

Image tests fail nondeterministically.

Expected behavior

Image tests pass.

Environment

- OS: macOS 26
- Xcode: 26
- Container: 0.7.1

Relevant log output

N/A

Code of Conduct

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