Update dependencies and improve project configuration

[stevejgordon]

As titled.

Also improves the test code to avoid stale artifacts affecting test runs causing flakiness.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Enterprise

Run ID: f436e608-6cc7-4203-9af8-19337210974f

📥 Commits

Reviewing files that changed from the base of the PR and between 5e9000a and 43e5adf.

📒 Files selected for processing (1)

• tests/Elastic.OpenTelemetry.IntegrationTests/RedistributableFixture.cs

📝 Walkthrough

Walkthrough

Centralized NuGet versions were updated (OpenTelemetry, build/test tooling) and Microsoft.Extensions package pinning changed to range-based overrides per TFM. Aspire app-host configuration was added via aspire.config.json and the AppHost project switched to the Aspire SDK. Enum generator package references migrated to NetEscapades.EnumGenerators.Generators with explicit asset includes. Instrumentation scripts now set OTEL_DOTNET_AUTO_REDIRECT_ENABLED=false. Integration tests and fixtures were revised to publish per-TFM test apps (net8/net9/net10 and net462), create isolated MSBuild output paths, invalidate global NuGet cache entries, and add new test app projects.

Possibly related PRs

• Add Central Configuration (via OpAMP) Support #392: Adds OpAMP/central-configuration support (OpAmp client packages, central configuration classes, AssemblyLoadContext handling, packaging and tests), which overlaps code and dependency changes in this PR.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch update-dependencies

• 🛠️ Update Documentation: Commit on current branch
• 🛠️ Update Documentation: Create PR

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[hegerchr]

LGTM

[hegerchr]

LGTM