[Cases] Move attachments into single tab (with subtabs) #243968
Description
As part of https://github.com/elastic/security-team/issues/14467 epic, we want attachments to be rendered in a single tab, with subtabs per attachment type
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As part of https://github.com/elastic/security-team/issues/14467 epic, we want attachments to be rendered in a single tab, with subtabs per attachment type