Add OpenAPI documentation for project related entities
What does this MR do and why?
Contributes to #376971
- Adds documentation for project related Grape entities.
Explanation I divided the work into smaller pieces to avoid merge conflicts and to simplify the review process.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Vasilii Iakliushin