CLDC 2286 Delete logs (#1620)
* Add LogPolicy
* Add letting log delete flow
* Add delete sales log flow
* Test for presence of buttons
* Use govuk_button_link_to
* Move actions to helper
* Allow deletion of delete and in progress logs
* better handle 500 error
* Soft delete logs
* Move specs to shared spec file
* Address comments
* Add scoping for data coordinators
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