remove Subject.consent_waiting_since

Merged Hayat requested to merge 2628-rm-temporary-consent-waiting-since into main

Since the change in how recruitment consent is handled from last release, new subjects are assumed to have been asked for recruitment consent at the time of their creation. The same customizable courtesy period that existed before is also being used now to prevent subjects without any legal basis (including recruitment consent) from being deleted withing this period. "consent_waiting_since" was used for subjects that were created before the last release and which have not given recruitment consent. For these subjects it would not have been possible to track since when we have been waiting for them to either give or decline consent. "consent_waiting_since" temporary saved this information. As X weeks have passed since its introduction, all subjects without legal basis created before the last release that have still neither given nor declined recruitment consent are considered as having no valid consent and will thus be marked for deletion.

Edited by Hayat

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