[Framework] Refer to entity in upsert entity response

[omby8888]

Description

What - Refer to entity in upsert entity response
Why - Response from upsert entity api isn't processed right and causes ocean core to use the raw entity that contains dict typed relation instead of string which is the relation's entity identifier
How - Simply refer to the entity key in a response that looks like {ok: true, entity: {...}}

Type of change

Please leave one option from the following and delete the rest:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• New Integration (non-breaking change which adds a new integration)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Non-breaking change (fix of existing functionality that will not change current behavior)
• Documentation (added/updated documentation)

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API Documentation

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[matan84]

2 small comments

[matan84]

LGTM