Add implicit conversions to CodeInterpreterToolContainer union

[Copilot]

Applies the same fixes from PR #901 (McpToolCallApprovalPolicy) to CodeInterpreterToolContainer.

Changes

• Added implicit conversion from string (container ID) to CodeInterpreterToolContainer
• Added implicit conversion from CodeInterpreterToolContainerConfiguration to CodeInterpreterToolContainer
• Added Argument.AssertNotNull checks in constructors
• Added [CodeGenVisibility] attribute to generate internal parameterless constructor

Example

// Before
CodeInterpreterToolContainer container = new(CodeInterpreterToolContainerConfiguration.CreateAutomaticContainerConfiguration());

// After - implicit conversion
CodeInterpreterToolContainer container = CodeInterpreterToolContainerConfiguration.CreateAutomaticContainerConfiguration();

// Also works with container IDs
CodeInterpreterToolContainer container = "my-container-id";

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• sqdvsblobprodcus333.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet build src/OpenAI.csproj (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

This PR made a few fixes to McpToolCallApprovalPolicy, which is a union of a CustomMcpToolCallApprovalPolicy and a GlobalMcpToolCallApprovalPolicy: #901

Could you make the same fixes to CodeInterpreterToolContainer, which is a union of a CodeInterpreterToolContainerConfiguration and a string container ID?

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