updated file creation

[farhanW3]

PR-Codex overview

The focus of this PR is to update the file path for saving and using the OpenAPI JSON response in the generate-sdk.ts script.

Detailed summary

• Updated the file path for saving the OpenAPI JSON response from ./dist/openapi.json to openapi.json.
• Updated the file path for using the OpenAPI JSON response in the yarn openapi command.

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