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790184db - [ty] Fix Gitlab codequality output format for empty diagnostics (#22833)

[ty] Fix Gitlab codequality output format for empty diagnostics (#22833) ## Summary Closes https://github.com/astral-sh/ty/issues/2617 This PR fixes the behavior of `ty check --output-format=gitlab` when there are no diagnostics. Previously, the output file was empty (0 bytes) if no errors were found, but GitLab expects an empty JSON list (`[]`) in this case (https://docs.gitlab.com/ci/testing/code_quality/#code-quality-report-format). As stated : "The file you provide as [Code Quality report artifact](https://docs.gitlab.com/ci/yaml/artifacts_reports/#artifactsreportscodequality) must contain a single JSON array." Now, when the GitLab format is selected and there are no diagnostics, `[]` is written to the output file, ensuring compatibility with GitLab CI/CD. ## Test Plan Ran `ty check --output-format=gitlab` on a project with no errors and verified that the output file contains `[]`. Ran `ty check --output-format=gitlab` on a project with errors and verified that the output file contains the expected JSON diagnostics list. Confirmed that other output formats are unaffected. --------- Co-authored-by: Brent Westbrook <brentrwestbrook@gmail.com>