Use bootc utils

[cgwalters]

No description provided.

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[gemini-code-assist]

Code Review

This pull request refactors the codebase to use shared command execution utilities from the bootc-internal-utils crate. This is achieved by removing the local cmdutils.rs module and replacing its usages with functions from the new dependency. The changes consistently replace manual command status checks with more concise and readable helper functions like run_inherited() and run_capture_stderr(). This is a good improvement for code maintainability and reusability. The implementation looks solid and I have no concerns.

[openshift-ci]

@cgwalters: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/fcos-e2e	f08bae1	link	true	/test fcos-e2e

Full PR test history. Your PR dashboard.

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