Fix: (#3383) openapi yaml req body not importing

[arshan1019]

Description

Fix: #3383 Request body not imported from OpenAPI YAML

• It was happening because of the shared Sets. hence used independent Sets for each recursive reference resolution to prevent skipping references.

Fix reference resolution by using independent Sets for recursion

Contribution Checklist:

• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
• I have added screenshots or gifs to help explain the change if applicable.
• I have read the contribution guidelines.
• Create an issue and link to the pull request.

Before:

After:

[bricht]

Waiting for this to be merged 🤞