FEATURE: Default allow embed secure images in email to true (PR #10688)

We are making the changes from the PR https://github.com/discourse/discourse/pull/10563 the default behaviour. Now, if secure media is enabled, secure images will be embedded in emails by default instead of redacting them and displaying a message. This will be a nicer overall experience by default, and for forums that want to be super strict with redaction this setting can always be disabled.


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