CWL YAML parsing/encoding updates

[caroott]

This PR updates CWL YAML parsing/encoding behavior and broadens regression coverage, while upgrading YAMLicious to 1.0.0-alpha.4.

Changes

• Improved YAML input cleanup to remove whitespace-only separator lines without disrupting block scalar content.
• Fixed expression handling so inline and multiline ExpressionTool expressions roundtrip more reliably in both standalone tools and workflow step run blocks.
• Aligned CWL encode/decode paths with updated YAML content and SchemaSaladString handling to preserve include/import/literal forms consistently.
• Added and updated tests for whitespace sanitization, expression roundtrips, doc block preservation, and requirement/listing include/import edge cases.
• Updated YAMLicious package version from 1.0.0-alpha.3 to 1.0.0-alpha.4.

Yamlicious Library Updates

1.0.0-alpha.4 (Released 2026-02-24)

• Add support for YAML directives and multi-document markers in reader and writer flows
• Add block scalar and scalar-style parsing/writing with improved roundtrip preservation
• Improve escape and scalar parsing robustness, including UTF-32 handling for Python target
• Expand regression and edge-case test coverage, and replace StringBuilder with a Fable-friendly custom buffer