Do not merge - testing new Gold backend

[Piinks]

Part of flutter/flutter#172933

We're standing up a new instance of Gold for flutter/packages to be able to execute golden file tests (for future material and cupertino packages).
The frontend is not up yet, but this new instance will be using a different backend than the flutter/flutter instance, so I am poking and testing here to validate a few things

Pre-Review Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
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• I signed the CLA.
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• I linked to at least one issue that this PR fixes in the description above.
• I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or I have commented below to indicate which version change exemption this PR falls under¹.
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[gemini-code-assist]

Code Review

This pull request introduces a goldctl dependency to the web_dart_unit_tests_wasm CI target, likely for testing a new Gold backend. The change is straightforward. My review includes one suggestion to improve the maintainability of the YAML configuration by using native YAML structures instead of an embedded JSON string.

[gemini-code-assist]

For improved readability and maintainability, consider using native YAML syntax for the dependency list instead of embedding a JSON string. This makes the configuration easier to read and modify, especially if more dependencies are added in the future. Most modern CI systems can correctly parse structured YAML properties.

      dependencies:
        - dependency: goldctl
          version: git_revision:2387d6fff449587eecbb7e45b2692ca0710b63b9

[Piinks]

Closing, got what I needed to develop further.