Correct the "No Such Event" behavior for Gmail policies with multiple settings

[adhilto]

🗣 Description

GWS.GMAIL.5.5v0.3 and GWS.GMAIL.7.6v0.3 both had custom "no such event" rules, as they both rely on multiple settings. Before, the logic of these rules was basically, "if any of these settings have at least one event, set no such event to false." I changed the logic to "If any of these settings have no events, set no such event to true."

💭 Motivation and context

Closes #368. TLDR: the old logic was resulting in false negatives.

🧪 Testing

• Added new unit tests to cover edge case.
• Manually tested, worked as expected

✅ Pre-approval checklist

• x ] 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.