fix: security html module removes allow attribute from iframes (#2354)
fix: security html module removes allow attribute from iframes (#2354)

* fix: secure html module removes allowfullscreen, allow and frameborder attributes from iframes
* Apply suggestions from code review
fix: remove deprecated attributes for iframe in secure html module

Co-authored-by: Nicolas Giard <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@ngpixel.com>
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