Add OpenAPI Specification for /queries/ endpoint and fix the incorrect specs

[varshadr]

This is a part of the API Documentation project #2888

Problem

To ensure the accuracy of the specs generated by drf-spectacular, we will generate an OpenAPI Specification specifically for a particular endpoint. This will allow us to verify its correctness by comparing it with the existing test cases and the DRF browsable API page. This issue aims to generate spec for /queries/ endpoint.

Proposed solution

• Add /queries/ to the custom preprocessing hook function to filter out all endpoints except for the /queries/ endpoint.
• Generate the spec file using the ./manage.py spectacular --color --file schema.yml command