Remove or fix `/enumerations/NAME` endpoint

[joeflack4]

Currently seems to return same info as endpoint: ​/models​/{model}​/entities​/{entity}​/attributes​/{attribute} Eventually want to be same as: ​/models​/{model}​/entities​/{entity}​/attributes​/{attribute}/enumerations

Existing differences w/ other enumeration endpoint

Edit 2021/12/08: In recent terminology services meeting, I heard the only difference thing this endpoint has that the other one does not is the yaml format.

• Less information
• No mappings
• No urls
• Yaml format

Options

a. Remove redundant endpoint b. Duplicate functionality; essentially make a

[joeflack4]

Previous issue referencing same subject: #95