Fix create collection error when name equal to trashed one

[avvertix]

What does this PR do?

Fix a scenario were collections cannot be created if a collection with the same name exists under the same parent, but was trashed.

This also handles these cases

• Trashing a collection with the same name, creator and type, of an already trashed collection will result in a merge of both in a single collection
• Restoring a collection now deal with eventual collections created with the same name in the place where the collections needs to be restored

Review checklist

• Are unit tests required?
• Are Documentation changes needed?

Before merging

• Is history cleaned up? (or can be squashed on merge?)