CLDC-2570 Add merge organisations service and rake task (#1801)
* Create merge_organisations_service
* Refactor tests
* update schemes merge
* rename scope
* merge letings logs
* Merge sales logs
* refactor merge organisations service
* Rollback transaction if there's an error merging orgs
* Add logging
* add merge_organisations rake task
* mark organisations as merged
* update rake task
* Update rake task add tests for multiple merging orgs
* Add more tests for merging relationships
* Update merge logging
* set absorbing organisation relationship
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