[integ-tests] Re-enable DCV installation in integration tests for Ubuntu 24

[hanwen-cluster]

Description of changes

Re-enable DCV installation in integration tests for Ubuntu 24

Tests

• With this fix, build-image with "Deep Learning Base OSS Nvidia Driver GPU AMI (Ubuntu 24.04) 20251212" succeeds
• Without this fix, build-image with "Deep Learning Base OSS Nvidia Driver GPU AMI (Ubuntu 24.04) 20251212" fails

References

• Cookbook PR Move netplan+networkd configuration to before ubuntu-desktop installation aws-parallelcluster-cookbook#3125

Checklist

• Make sure you are pointing to the right branch.
• If you're creating a patch for a branch other than develop add the branch name as prefix in the PR title (e.g. [release-3.6]).
• Check all commits' messages are clear, describing what and why vs how.
• Make sure to have added unit tests or integration tests to cover the new/modified code.
• Check if documentation is impacted by this change.

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