WS 'hotspot/search' returns no issue if the 'sinceLeakPeriod' filter is used

Unlike `issue/search`, `hotspot/search` WS is not applying correctly the filter `sinceLeakPeriod`.

Instead of resolving the start of the New Code period for each project that belongs to the application, it's setting it as if the application itself had a New Code period.

An IT should be added.