Fix up OpenAPI schema handling and support concurrent requests #58024
+224
−13
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Description
This PR backports #57972 to resolve issues with concurrent requests to OpenAPI documents (fixes #57876).
This PR also addresses a set of issues with generated schemas:
Customer Impact
This PR resolves a set of bugs reported by users of .NET 9 RC 1 for which no viable workarounds exist.
Regression?
Risk
Changes localized to OpenAPI package.
Verification
Packaging changes reviewed?