[OTEL-2899] Check for exception span events instead of promoted attributes

[jade-guiton-dd]

Motivation

This PR in Datadog Agent removed old logic that was mapping attributes from exception span events onto the parent span. This used to be necessary before we started supporting span events, but is now causing duplicate entries in Error Tracking. This PR updates the corresponding test.

Changes

I replaced the test which checks for error.type / error.stack attributes on the span by one which checks for a span event with analogous attributes.

Workflow

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   • 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

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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

[github-actions]

CODEOWNERS have been resolved as:

tests/integrations/test_open_telemetry.py                               @DataDog/system-tests-core