fix: make evals work with standalone phoenix client package

[pedroslopez]

At somepoint i moved from the phoenix package, which is huge and contains the full platform, to the standalone packages we need (phoenix-client, phoenix-otel, phoenix-evals)

When I made the package switch, things broke due to slightly different behavior on the phoenix-client package. I didn't notice since locally the old package was still installed.

This updates the syntax to work with the standalone client.

[github-actions]

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[github-actions]

PyTest Results (Fast)

0 tests  ±0   0 ✅ ±0   0s ⏱️ ±0s
0 suites ±0   0 💤 ±0 
0 files   ±0   0 ❌ ±0 

Results for commit d2deb66. ± Comparison against base commit e9230df.

[Copilot]

Pull Request Overview

Fixes compatibility with the standalone Phoenix client package by updating imports and API calls. The changes migrate from the monolithic phoenix package to the standalone phoenix-client package, which has slightly different API patterns.

• Replaced synchronous experiment API with async client pattern
• Updated imports to use standalone package structure
• Added async/await support for the new client API

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
connector_builder_agents/src/evals/phoenix_run.py	Migrated to async Phoenix client API and restructured main execution
connector_builder_agents/src/evals/dataset.py	Updated import path for Dataset type to match standalone package

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