Don't produce histograms in /telemetry JSON response

[xzfc]

Issue

An OpenAPI generator chokes on schema changes introduced in #3552, in particular, on heterogeneous arrays in the duration_micros_histogram field.

The error message is:

$ docker run --user 1000:100 --rm -v /run/user/1000/tmp.nu7jls5JNY/pydantic_openapi_v3/scripts/output:/generator-output -v /run/user/1000/tmp.nu7jls5JNY/pydantic_openapi_v3/openapi-qdrant.yaml:/local/openapi.yaml openapitools/openapi-generator-cli:v5.1.1 generate -g python --global-property debugModels=true -o /generator-output -i /local/openapi.yaml
Exception in thread "main" org.openapitools.codegen.SpecValidationException: There were issues with the specification. The option can be disabled via validateSpec (Maven/Gradle) or --skip-validate-spec (CLI).
 | Error count: 2, Warning count: 0
Errors: 
	-attribute components.schemas.OperationDurationStatistics.items is not of type `object`
	-attribute components.schemas.OperationDurationStatistics.items is missing

	at org.openapitools.codegen.config.CodegenConfigurator.toContext(CodegenConfigurator.java:546)
	at org.openapitools.codegen.config.CodegenConfigurator.toClientOptInput(CodegenConfigurator.java:573)
	at org.openapitools.codegen.cmd.Generate.execute(Generate.java:433)
	at org.openapitools.codegen.cmd.OpenApiGeneratorCommand.run(OpenApiGeneratorCommand.java:32)
	at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:66)

Solution (this PR)

Drop these statistics from the JSON /telemetry output, regardless from the details level. Keep it in the Prometheus /metrics.