elasticotel: load resource detector as last

[xrmx]

What does this pull request do?

Since OTel SDK 1.42.0 the order of the resource detectors is preserved. Move the otel resource detector as last so we can override other resource detector attributes from environment variables.

Related issues

[github-actions]

🔍 Preview links for changed docs

• docs/reference/edot-python/configuration.md

[github-actions]

✅ Elastic Docs Style Checker (Vale)

No issues found on modified lines!

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Enterprise

Run ID: a08c4b9e-b5e2-4865-8afc-3e79019c57cd

📥 Commits

Reviewing files that changed from the base of the PR and between 7a17ce4 and f546aa2.

📒 Files selected for processing (4)

• docs/reference/edot-python/configuration.md
• src/elasticotel/distro/__init__.py
• tests/distro/test_distro.py
• tests/integration/test_integration.py

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📝 Walkthrough

Walkthrough

ElasticOpenTelemetryDistro._configure now appends otel after the cloud resource detectors so it runs last. The default configuration test and configuration reference were updated to match the detector ordering. A new integration test verifies that OTEL_RESOURCE_ATTRIBUTES can override telemetry.distro.name in emitted span resources.

🚥 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.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch move-otel-resource-detector-to-last

• 🛠️ Update Documentation

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