Add iframe security headers

[michaeljguarino]

checking security boxes

Test Plan

regression

Checklist

• [ ] If required, I have updated the Plural documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] I have added a meaningful title and summary to convey the impact of this PR to a user.
• [ ] I have added relevant labels to this PR to help with categorization for release notes.

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graphql-test-results	Visit	3f86fe1dcf8b432283d4aef69e4e2e5bfcd02e3b	✅

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