fix: update prettier to respect stderr and stdout concurrently

[tractorcow]

In cases where prettier fails to run (see https://github.com/wearerequired/lint-action/issues/718) output.stdout can be empty. Generating an annotation with a blank path causes a 422 validation error pushing this check to github.

I have updated the logic to check both stdout and stderr, applying appropriate checks and reporting where available.

[tractorcow]

For context this is the kind of output.stderr that can be encountered during linting.

[error] src/components/Icon/Icon.stories.tsx: SyntaxError: ',' expected. (32:3)
[error]   30 |     },
[error]   31 |   },
[error] > 32 | } satisfies Meta<typeof Icon>
[error]      |   ^
[error]   33 |
[error]   34 | export default meta
[error]   35 | type Story = StoryObj<typeof Icon>

If I were to parse this instead of output.stdout

[tractorcow]

Pushed a check to stderr. Below is an example of the check running against my own (failing) codebase. Previously this error would cause a 422 pushing the check to github, and give a false negative (green tick when it should be an error).

[tractorcow]

Unit tests presented :)

[github-actions[bot]]

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