Remove ModelConfig type as a temporary solution.

[nick863]

Description

In this PR we are removing types from the evaluator constructors as a temporary solution, before AzureOpenAIModelConfiguration type in the evaluator constructor will be officially supported.

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

• Pull request includes test coverage for the included changes.

[github-actions]

promptflow-evals test result

 12 files   12 suites   2m 9s ⏱️
 30 tests  30 ✅ 0 💤 0 ❌
360 runs  360 ✅ 0 💤 0 ❌

Results for commit 22e02a0.

♻️ This comment has been updated with latest results.