create_engine returns a json called 'compute'

[tomasrelai]

When we create an engine, the json returned still says "compute" instead of "engine".

Similarly, the json for delete_engine also still uses compute.

[bradlo]

this is how the current REST API returns the payload. this will change when we upgrade to v2 of the REST API.

[billscheidel-rai]

Note: This issue has been migrated to https://relationalai.atlassian.net/browse/RAI-3831.

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