Add GroupPushRule to OpenAPI documetation

Vasilii Iakliushinrequested to merge
377030_enable_openapi_docs_for_group_push_rule into master

What does this MR do and why?

Contributes to #377030

  • Add field documentation for Grape::Entity
  • Add response codes for API endpoints

How to set up and validate locally

  1. Visit https://gitlab.com/gitlab-org/gitlab/-/blob/476621c5762a25eea560762c92b9037b654995ef/doc/api/openapi/openapi_v2.yaml

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Vasilii Iakliushin

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