Open Telemetry Collector doesn't work on Windows #852
Description
Describe the bug
Using the Otel Collector on windows results in the collector entering the "FailedToStart" state. This happens because the dev cert certificate paths end up with invalid characters due to Path.Combine() using windows directory separators rather than unix ones.
Regression
No response
Steps to reproduce
Run the open telemetry sample project on windows.
dotnet run --project .\examples\opentelemetry-collector\CommunityToolkit.Aspire.Hosting.OpenTelemetryCollector.AppHost\
Expected behavior
Open Telemetry Collector should start properly.
Screenshots
No response
IDE and version
VS Code, Other, VS 2022
IDE version
.NET SDK: 9.0.304 f12f5f689e
Nuget packages
latest main (b98f4c2eb41ae7b0a217465e9429820aedca3248)
Additional context
https://discord.com/channels/1361488941836140614/1375617984512528567/1414908067518222369
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