Chore/update aibom test docs

[sburuiana-snyk]

Updates snyk aibom test documentation to match current CLI behavior:

• Removes references to open/ignored issue grouping and closed issues in JSON output;
• Updates docs to reflect latest changes to --severity-threshold parameter;
• Adds snyk aibom test to the CLI commands summary and severity-thresholds page.

---

Note

Low Risk
Markdown-only documentation changes with no runtime or security impact.

Overview
Updates snyk aibom test help and cross-references so they match how the command works today.

The aibom-test page no longer describes open vs ignored issue groupings, closed issues in JSON, or separate open/ignored counts in the test summary. Output is described as a single issue list and severity-based summary. Exit codes and --severity-threshold are clarified: exit 1 applies to issues at or above the threshold (default low), and the threshold filters the console report, summary, and --json-file-output.

The CLI commands summary and severity thresholds guide now list snyk aibom test for --severity-threshold and extend --json-file-output under the aibom options to include test.

^{Reviewed by Cursor Bugbot for commit b1dbc25. Bugbot is set up for automated code reviews on this repo. Configure here.}

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