Do not show the same ad more than once every hour

[jsecretan]

Description

Even though we now have the capability for user level frequency capping, and there are coming improvements to evening out the pacing of ad delivery, there can still be cases where either limited inventory in certain categories can make it feel like ads are repeated too often. To help this, I am proposing that we limit repeating a campaign id to no more than once an hour. This is not a setting transmitted in the catalog, but a hard coded browser setting.

[LaurenWags]

Confirmed with @srirambv that this was tested on mobile. Only desktop needs to be tested by QA.

[LaurenWags]

Still seeing ads for same campaign_id in the same hour. Will work with @tmancey when he's available. Marking as QA/Blocked until that is sorted.