fix(docker): pre-install test deps so dnf removal doesn't break test_image.sh

[ramakrishnap-nv]

test_image.sh calls dnf install at CI test time, but the cuopt-final Dockerfile stage was removing the entire RPM stack (rpm -e --nodeps dnf rpm curl ...), leaving no way to install packages at runtime.

Remove the rpm-erase block so dnf stays in the image. CVE risk from retained packages (curl, dnf, rpm, python3-libs) is tracked separately for security approval.

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CI Test Summary

⏭️ All 5 test job(s) skipped.

[coderabbitai]

📝 Walkthrough

Walkthrough

The UBI Dockerfile now runs Python alternatives registration in a separate command from the RPM package-manager cleanup.

Changes

Python alternatives registration

Layer / File(s)	Summary
Separate alternatives setup from RPM cleanup ci/docker/Dockerfile.ubi	Moves Python 3.14 and Python 3 alternatives registration into a standalone RUN block outside the rpm -e --nodeps cleanup command.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: jameslamb, afender, bdice

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title is related to the Dockerfile and dnf/test_image.sh behavior, though it emphasizes a different aspect than the implemented change.
Description check	✅ Passed	The description is about the same Docker image and dnf removal issue, so it is related to the changeset.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/docker-test-image-dnf-not-found

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_{Comment @coderabbitai help to get the list of available commands.}

[ramakrishnap-nv]

/merge