Update to.NET Runtime Metrics Default to true

[link04]

Motivation

For .NET we are changing the default of DD_RUNTIME_METRICS_ENABLED to true starting .NET 6+.

Changes

Updated SDK_DEFAULT_STABLE_CONFIG to add true for .NET.

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes
3. Mark it as ready for review
   • Test logic is modified? -> Get a review from RFC owner.
   • Framework is modified, or non obvious usage of it -> get a review from R&P team

🚀 Once your PR is reviewed and the CI green, you can merge it!

🛟 #apm-shared-testing 🛟

Reviewer checklist

• Anything but tests/ or manifests/ is modified ? I have the approval from R&P team
• A docker base image is modified?
  • the relevant build-XXX-image label is present
• A scenario is added, removed or renamed?
  • Get a review from R&P team

[datadog-prod-us1-3]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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[github-actions]

CODEOWNERS have been resolved as:

manifests/dotnet.yml                                                    @DataDog/apm-dotnet @DataDog/asm-dotnet
tests/parametric/test_config_consistency.py                             @DataDog/apm-sdk-capabilities

[genesor]

Note for the future: When testing default value we should have one test checking default: true and default: false

Having values changing depending on the library in the test code is not ideal for a test in charge of "consistency"