[OpenApi] Test schema reference validity #63095
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Test schema reference validity
Add integration test for invalid OpenAPI schema references.
Description
Add a draft of a way to test whether OpenAPI schema references are invalid which builds on top of #63092.
The test fails as it reveals the two issues described in #63090.
Will separately open a feature request for Microsoft.OpenApi to have this built-in to the validation rulesets.microsoft/OpenAPI.NET#2453