fix: limit diagnostics-format options to actually supported formats (fixes #2007)

[gavin913427-hash]

What

Limit --diagnostics-format options to only the actually supported formats.

Why

The help message showed 12 formats but only 7 were actually supported. The unsupported formats (github-actions, sarif, code-climate, gitlab, markdown) would silently fall back to stylish format, which was confusing for users.

How

• Changed the diagnostics-format flag options from Object.values(OutputFormat) to a hardcoded list of the 7 supported formats
• Removed the unused OutputFormat import

Changes

File	Change
src/apps/cli/internal/flags/parser.flags.ts	Limit options to supported formats, remove unused import

Testing

# Before: shows 12 options in help
asyncapi validate --help

# After: shows only 7 supported options
asyncapi validate --help
# Options: stylish, json, junit, html, text, teamcity, pretty

Fixes #2007

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Latest commit: 43e480b

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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