Support blockquote alerts in the product #17660
Description
We should support the Alerts markdown ext so that we are able to display stuff like this in the product:
Note
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We are already using it, but I only noticed today that it was misrendered in the product (and in the registry) (e.g in azure-linux).
If it's too much effort to support it, we should at least strip it to avoid it looking weird.
