Python: Surface A2A preview consent URLs

[LeoZhaoo (LobsterQBA)]

Motivation & Context

When a Work IQ tool source returns CONSENT_REQUIRED with type: "a2a_preview", the Foundry Hosting responses server currently ignores the consent URL because it only accepts mcp sources. This leaves callers without the URL needed to complete consent.

Description & Review Guide

• What are the major changes? Allow consent_url_from_error to recognize both mcp and a2a_preview consent sources, and add a regression test for the latter.
• What is the impact of these changes? Responses clients can surface the consent URL for Work IQ A2A-preview tool sources while preserving the existing MCP behavior.
• What do you want reviewers to focus on? The intentionally narrow source-type allowlist and its regression coverage.

Prepared with AI assistance; the change was reviewed and validated locally by the contributor.

Related Issue

Fixes #7227

Contribution Checklist

• The code builds clean without any errors or warnings
• All unit tests pass, and I have added new tests where possible
• The PR follows the Contribution Guidelines
• This PR is linked to an issue and there is no other open PR for this issue (see Related Issue above).
• This is not a breaking change. If it is a breaking change, add the breaking change label (or add "[BREAKING]" to the title prefix, before or after any language prefix) — a workflow keeps the label and title prefix in sync automatically.

[Copilot]

Pull request overview

Extends Foundry Hosting consent extraction to support Work IQ A2A-preview sources while preserving MCP behavior.

Changes:

• Allows mcp and a2a_preview consent sources.
• Adds an A2A-preview parser regression test.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
_responses.py	Expands the consent source allowlist.
test_responses.py	Adds configurable test data and A2A-preview coverage.

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