RFR: 8353321: [macos] ErrorTest.testAppContentWarning test case requires signing environment

[Alexey Semenyuk]

On Mon, 31 Mar 2025 21:26:54 GMT, Alexey Semenyuk <asemenyuk at openjdk.org> wrote:

> Move `ErrorTest.testAppContentWarning()` test case to `MacSignTest.testAppContentWarning()` and rework it to fail because of faulty app content and not invalid signing identity.
> 
> MacSignTest is supposed to be a placeholder for tests that require a signing environment but don't fit in any existing signing tests.

@sashamatveev PTAL

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PR Comment: https://git.openjdk.org/jdk/pull/24338#issuecomment-2767446785