RFR: 8328716: [TestBug] Screen capturing utility for failed tests [v6]

[Andy Goryachev]

On Fri, 4 Apr 2025 21:43:41 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> in a JSON image, you wouldn't have the `""data:image/png;base64,"` prefix?

correct, the prefix would be something else, like
`takeScreenshotBase64("{screenshot:","}");`

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PR Review Comment: https://git.openjdk.org/jfx/pull/1746#discussion_r2029471358