Allow webhook dry run for events emitted by bulk mutations.

[zedzior]

Problem

Currently dry run works for webhooks with subscriptable object being model instance. For bulk mutations we return list of model instances and the case is not handled.

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1. General Assumptions

Acceptance Criteria

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2. API changes

Mutations

Types

3. Database changes

4. UML diagrams

5. To Do list

Tasks

Beta Give feedback

1. Add a draft title or issue reference here

6. To Test

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