Default-enable include_csp_frameworks and security_policies_csp feature flags

Jean van der Waltrequested to merge
556785-feature-flag-include_csp_frameworks-rollout into master

What does this MR do and why?

Moves feature flags to beta, and enables them by default.

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Related to #556785 (closed), #550318 (closed)

Edited by Dominic Bauer

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