Fix a memory leak caused by Banzai::Filter::SanitizationFilter

username-removed-506061 requested to merge fix/sanitization-filter-leak into master

What does this MR do?

It creates a dup of Banzai::Filter::SanitizationFilter whitelist transformers container to avoid a memory leak (more details in the commit message).

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Why was this MR needed?

Memory leaks are BAD :)

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Does this MR meet the acceptance criteria?

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