TRCLI-230: Support for passing quality rating values using --result-fields option

[acuanico-tr-galt]

Solution description

Allow users now apply quality ratings globally to all test results using the --result-fields CLI option for AI Evaluation Template

Changes

• Enhanced TestRailResult.add_global_result_fields() to handle quality_rating specially
• Parses and validates quality_rating from --result-fields using QualityRatingParser
• Test-specific quality ratings (from XML/JSON properties) always take precedence over CLI global ratings

Potential impacts

None.

Steps to test

See updated README Line 579-641

Behavior:

• Tests without quality_rating property → Get CLI global rating
• Tests with quality_rating property → Keep their specific rating (override CLI)
• Invalid CLI rating → Immediate error before upload
• Invalid property rating → Log warning, continue upload

PR Tasks

• PR reference added to issue
• README updated
• Unit tests added/updated