fix(auth): ensure proxy OAuth URL includes response_type cleanly

[jeevan6996]

Summary

• remove whitespace artifacts from the manually constructed proxy OAuth authorization URL so query parameter keys are emitted exactly as expected
• ensure response_type=code is always present and not prefixed by encoded/leading spaces when proxy login flow is used
• extend unit coverage for build_proxy_auth_url to assert clean response_type formatting and include a patch changeset

Fixes #695

[changeset-bot]

🦋 Changeset detected

Latest commit: 05c28aa

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@googleworkspace/cli	Patch

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue where the proxy OAuth authorization URL was being constructed with unintended whitespace, causing potential failures in the authentication flow. By flattening the URL string construction, the change ensures that query parameters are emitted cleanly and consistently.

Highlights

• URL Formatting: Removed whitespace artifacts from the manually constructed proxy OAuth URL to ensure query parameters are correctly parsed.
• Testing: Added unit test assertions to verify that the response_type parameter is correctly formatted without leading spaces or encoding issues.

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[gemini-code-assist]

Code Review

This pull request fixes OAuth proxy login URL formatting by consolidating the URL string into a single line within the build_proxy_auth_url function. This change ensures that parameters like response_type=code are correctly preserved without unintended whitespace or encoding issues. Unit tests have also been updated to verify the presence of the correct parameters and the absence of malformed spacing. I have no feedback to provide.