feat: export evaluator spans

[ameyjain]

Export evaluator LLM call spans with the same trace_id as agent execution spans. This allows both agent and evaluator spans to be fetched together using a single ID.

Changes:

• Add evaluator_spans field to EvalRunUpdatedEvent
• Collect evaluator spans after all evaluators run in _execute_eval
• Export evaluator spans with the correct trace_id in handle_update_eval_run

Development Package

• Use uipath pack --nolock to get the latest dev build from this PR (requires version range).
• Add this package as a dependency in your pyproject.toml:

[project]
dependencies = [
  # Exact version:
  "uipath==2.5.4.dev1011303908",

  # Any version from PR
  "uipath>=2.5.4.dev1011300000,<2.5.4.dev1011310000"
]

[[tool.uv.index]]
name = "testpypi"
url = "https://test.pypi.org/simple/"
publish-url = "https://test.pypi.org/legacy/"
explicit = true

[tool.uv.sources]
uipath = { index = "testpypi" }

[tool.uv]
override-dependencies = [
    "uipath>=2.5.4.dev1011300000,<2.5.4.dev1011310000",
]

BEFORE

After

[AAgnihotry]

@ameyjain how did you get these 2 traces ?