Add setuptools as an explicit dependency for now.

[nick863]

Description

Fix the issue with the pkg_resources not being find. See work item 3202015.

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• The pull request does not introduce [breaking changes].
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.
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Testing Guidelines

• Pull request includes test coverage for the included changes.

[github-actions]

promptflow-evals test result

  9 files  ±0    9 suites  ±0   1h 26m 39s ⏱️ - 2m 53s
 39 tests ±0   35 ✅ ±0   4 💤 ±0  0 ❌ ±0 
351 runs  ±0  315 ✅ ±0  36 💤 ±0  0 ❌ ±0 

Results for commit 084e70d. ± Comparison against base commit 96dbf33.

♻️ This comment has been updated with latest results.

[nick863]

This PR is not needed because explicit mlflow dependency was removed.