Change OTLP endpoint to use HTTP

[martincostello]

Refactor the .NET example to detect #734.

Resolves #734.

[martincostello]

Verified locally that the tests fail if I downgrade the OpenTelemetry Collector to v0.133.0.

[Copilot]

Pull Request Overview

Refactors the .NET example to use standard OpenTelemetry environment variables for OTLP configuration instead of custom configuration, changing from gRPC (port 4317) to HTTP/protobuf (port 4318) protocol.

• Replaces custom Otlp__Endpoint configuration with standard OTEL_EXPORTER_OTLP_ENDPOINT environment variable
• Switches from gRPC protocol (port 4317) to HTTP/protobuf protocol (port 4318)
• Simplifies code by using UseOtlpExporter() extension method instead of manual OTLP exporter configuration

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
examples/dotnet/docker-compose.yml	Updates environment variables to use standard OTLP configuration with HTTP protocol
examples/dotnet/docker-compose.oats.yml	Updates environment variables to use standard OTLP configuration with HTTP protocol
examples/dotnet/appsettings.json	Removes custom Otlp configuration section
examples/dotnet/Program.cs	Simplifies OpenTelemetry setup using UseOtlpExporter() and removes manual OTLP configuration

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