Revert "feat(ContentSecurityPolicy): Add a content security policy (#… #909

Job	Run time
auto / deploy	8m 12s
auto / Run Smoke Tests against dev	2m 50s
auto / Run Critical User Journeys against dev	1m 15s
auto / Redeploy Dotcom Monitor dev if needed	4s
notify / slack	3s
	12m 24s

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