Add enterprise file search

[nick863]

• Add enterprise file search sample
• Add Code interpreter sample
• Add batch file search and enterprise batch file search sample
• Add code changes to expose appropriste interfaces.

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[azure-sdk]

API change check

APIView has identified API level changes in this PR and created following API reviews.

Azure.AI.Projects

Copilot reviewed 5 out of 13 changed files in this pull request and generated 4 comments.

Files not reviewed (8)

• sdk/ai/Azure.AI.Projects/api/Azure.AI.Projects.net8.0.cs: Evaluated as low risk
• sdk/ai/Azure.AI.Projects/tests/Samples/Agent/Sample_Agent_Enterptise_File_Search.cs: Evaluated as low risk
• sdk/ai/Azure.AI.Projects/api/Azure.AI.Projects.netstandard2.0.cs: Evaluated as low risk
• sdk/ai/Azure.AI.Projects/src/Custom/Agent/FileSearchToolResource.cs: Evaluated as low risk
• sdk/ai/Azure.AI.Projects/src/Custom/Agent/MessageAttachment.cs: Evaluated as low risk
• sdk/ai/Azure.AI.Projects/tests/AIProjectsTestEnvironment.cs: Evaluated as low risk
• sdk/ai/Azure.AI.Projects/tests/Samples/Agent/Sample_Agent_OpenAPI.cs: Evaluated as low risk
• sdk/ai/Azure.AI.Projects/tests/Samples/Agent/Sample_Agent_Vector_Store_Batch_Enterptise_File_Search.cs: Evaluated as low risk

Comments suppressed due to low confidence (2)

sdk/ai/Azure.AI.Projects/tests/Samples/Agent/Sample_Agents_Code_Interpreter_File_Attachment.cs:44

• Incorrect list initialization syntax. Use 'new List()' instead of square brackets.

var attachment = new MessageAttachment(fileId: fileId, tools: tools);

sdk/ai/Azure.AI.Projects/tests/Samples/Agent/Sample_Agents_Code_Interpreter_File_Attachment.cs:14

• [nitpick] Class name should be 'SampleAgentsCodeInterpreterFileAttachment' for consistency.

public partial class Sample_Agents_Code_Interpreter_File_Attachment : SamplesBase<AIProjectsTestEnvironment>