[Merge] lp:~ken-vandine/content-hub/pasteboard into lp:content-hub

[Tyler Hicks]

Review: Needs Information

Ubuntu Security would like to review this change. We were involved in the early design stages and were awaiting an update to the design doc for this feature. The design doc that we have access to is still based on an old design that doesn't match this implementation. We're blocked until the doc can be updated.
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https://code.launchpad.net/~ken-vandine/content-hub/pasteboard/+merge/296352
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