Test updated OTLP exporter

[martincostello]

Consume changes from open-telemetry/opentelemetry-dotnet#6567 for testing.

[Copilot]

Pull Request Overview

This PR updates OpenTelemetry packages to consume changes from an upstream pull request in the opentelemetry-dotnet repository for testing purposes. The changes enable local package testing by configuring NuGet to use a local package source and updating OpenTelemetry packages to pre-release alpha versions.

• Adds local package source configuration to NuGet.config
• Updates OpenTelemetry packages to alpha versions (1.13.1-alpha.0.11)

Reviewed Changes

Copilot reviewed 2 out of 12 changed files in this pull request and generated no comments.

File	Description
NuGet.config	Adds local package source and mapping for OpenTelemetry packages
Directory.Packages.props	Updates OpenTelemetry package versions to pre-release alpha builds

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.68%. Comparing base (22ad75b) to head (7b1ec4c).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2797      +/-   ##
==========================================
+ Coverage   86.34%   86.68%   +0.34%     
==========================================
  Files         115      115              
  Lines        4349     4349              
  Branches      500      500              
==========================================
+ Hits         3755     3770      +15     
+ Misses        464      449      -15     
  Partials      130      130              

Flag	Coverage Δ
linux	86.38% <ø> (+0.27%)	⬆️
macos	86.27% <ø> (ø)
windows	86.09% <ø> (ø)

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[costellobot]

Device	URL
desktop	https://localhost:50001/sign-in

Device	URL
mobile	https://localhost:50001/sign-in

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