Fix misc. live tests

[joseharriaga]

• Extend delays for VectorStore tests to mitigate flakiness
• Upgrade Moderation tests to the new omni-moderation-latest model to avoid failures when using the older text-moderation-stable model
• Move image generation tool in Responses to ResponsesToolTests.cs
• Add a delay to file search tool test in Responses to mitigate flakiness
• Re-record as needed

[Copilot]

Pull Request Overview

This PR updates the moderations tests to use the new omni-moderation-latest model instead of the deprecated text-moderation-stable model. The changes include:

• Updating the default model for moderations test scenarios
• Adjusting test assertions to match the new model's score thresholds
• Updating session recordings to reflect the new API responses
• Reorganizing test methods between test files
• Adding necessary delays for consistency in vector store tests

Reviewed Changes

Copilot reviewed 11 out of 21 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tests/Utility/TestHelpers.cs	Updates default moderation model from "text-moderation-stable" to "omni-moderation-latest"
tests/Moderations/ModerationsTests.cs	Adjusts violence score thresholds from 0.5 to 0.2 and updates model name assertion
tests/SessionRecords/ModerationsTests/*.json	Updates recorded API responses for the new omni-moderation model with additional fields
tests/SessionRecords/VectorStoresTests/*.json	Updates session recordings with new test data and reduced file counts
tests/Responses/ResponsesToolTests.cs	Adds System.Threading using statement and moves image generation tests from ResponsesTests
tests/Responses/ResponsesTests.cs	Removes image generation tests (moved to ResponsesToolTests)
tests/Assistants/Assistants.VectorStoresTests.cs	Increases delays from 1-2 seconds to 10 seconds for vector store operations

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.