Common Controls 12.1: correct Policy API implementation

[rlxdev]

🗣 Description

The implementation of the Common Controls 12.1 baseline using the Policy API has been fixed to give the correct results.
The initial implementation assumed a link between the "services without an individual admin control" and the individual takeout admin controls.

Closes #530

🧪 Testing

The tests for the Policy API implementation of Common Controls 12.1 have been updated to reflect the correct takeout setting functionality. The changes were made in commoncontrols_api12_test.rego.

The takeout settings were altered using the scubagws Admin UI to confirm that the correct result was produced by ScubaGoggles.

✅ 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.
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• 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.
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✅ Post-merge Checklist

• Delete the branch to clean up.
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