Correct DNS False Negatives

[adhilto]

🗣 Description

Corrected the bug that showed all DNS related checks as passing when the DNS functions failed.

💭 Motivation and context

Closes #147.

🧪 Testing

• Updated Rego test cases.
• Temporarily added exception (x/0) to the top of query function of the RobustDNSClient to simulate DNS failures

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• If applicable, All future TODOs are captured in issues, which are referenced in the PR description.
• The relevant issues PR resolves are linked preferably via closing keywords.
• All relevant type-of-change labels have been added.
• I have read and agree to the CONTRIBUTING.md document.
• These code changes follow cisagov code standards.
• All relevant repo and/or project documentation has been updated to reflect the changes in this PR.
• Tests have been added and/or modified to cover the changes in this PR.
• All new and existing tests pass.

✅ Pre-merge Checklist

• This PR has been smoke tested to ensure main is in a functional state when this PR is merged.
• Squash all commits into one PR level commit using the Squash and merge button.

✅ Post-merge Checklist

• Delete the branch to clean up.
• Close issues resolved by this PR if the closing keywords did not activate.

[rgbrow1949]

Added an exception to the query function and ran over gmail on main and this branch. Main reported no issues, this branch correctly showed issues in 2, 3, and 4. Approved.