The http target's destination URL can itself be a bearer credential, and
the source detail page rendered it in full. Render it through the
existing MaskURL instead, matching the rule already applied to slack
targets.
Independently reviewed: mutation-verified (reverting to the raw value
fails the absence assertions, not merely the masked-form ones), MaskURL
probed against userinfo, query, fragment, port, IPv6 literal and
non-http schemes, and every sibling path that surfaces target data
re-walked and found clean.