fix: copy specs local file refs

[fpaul-1A]

Proposed change

When we copy the spec file before generating the SDK we are breaking the local relative paths referenced in the file.
The proposed change is to copy all the referenced files inside the SDK in a folder ./spec-local-references/ to have them versioned.
We also update the local references in the spec to look for these files.

Related issues

• 🐛 Fixes [Bug]: openapi-generator 7.4.0 fails to resolve refs to files #2014
• 🚀 Feature #(issue)

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