OpenAPI TS generator: no required array means all fields are optional

[cikzh]

Right now the OpenAPI type generator assumes the absence of a required field means all fields are required, but the opposite is true; no required field, means all fields are optional.

To test

1. Run the generator on the main branch, should result in no diff
2. Create a Rust struct with optional fields only e.g.:

struct TestStruct {
    #[serde(skip_serializing_if = "Option::is_none")]
    #[schema(value_type = String, nullable = false)]
    test_field_one: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    #[schema(value_type = String, nullable = false)]
    test_field_two: Option<String>,
}

and see that the generator generates optional TS interfaces

[github-actions]

Sigrid maintainability feedback

💭️ You did not change any files that are measured by Sigrid

---

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.77%. Comparing base (5575746) to head (9c063b5).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
frontend/scripts/openapi/generator.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1018   +/-   ##
=======================================
  Coverage   89.77%   89.77%           
=======================================
  Files         248      248           
  Lines       12995    12995           
  Branches     1318     1318           
=======================================
  Hits        11666    11666           
  Misses       1235     1235           
  Partials       94       94           

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[oliver3]

Works!