Fix/441 cron scheduler improve

[TerranceKhumalo-absa]

Add Comprehensive Cron Validation and Cypress Testing

📋 Summary

This PR introduces significant improvements to the CPS Scheduler component including comprehensive cron validation, extensive Cypress end-to-end testing, and enhanced documentation. The changes focus on creating a robust, generic cron validation system that works across multiple platforms while maintaining strict type safety.

Resolves #441

🎯 Key Changes

✅ Enhanced Cron Validation Service

• Generic 6-field cron validation - Removed platform-specific restrictions to support various cron implementations
• Extended pattern support - Added validation for ranges, steps, lists, and special characters (L, W, #)
• Comprehensive syntax validation - Validates field ranges, mutual exclusivity rules, and complex patterns
• Type-safe implementation - Strict TypeScript validation with proper error handling

🧪 Comprehensive Cypress Testing

• End-to-end test coverage for all scheduler functionality
• Core functionality tests - Component initialization and basic interactions
• Cron generation validation - Tests for Minutes, Weekly, Monthly, and Advanced schedule types
• State management verification - Ensures proper state transitions between schedule types
• Timezone functionality testing - Autocomplete filtering and input validation
• Error handling scenarios - Rapid type switching and invalid input handling

Examples of Validated Patterns

'0 9 ? * MON-WED,FRI *'   // Monday through Wednesday and Friday
'*/15 * * * ? *'          // Every 15 minutes
'0 9-17/2 * * ? *'        // Every 2 hours from 9am to 5pm
'0 9 ? * MON#1 *'         // First Monday of month
'0 9 15W * ? *'           // Weekday nearest to 15th

Release Notes:

• Generic Cron Validation: Comprehensive 6-field cron expression validation supporting ranges, steps, lists, and special characters (L, W, #)
• Cypress E2E Testing: Complete test coverage for all scheduler functionality including state management, timezone handling, and complex cron patterns

[lukasmatta]

Good job, I appreciate the thorough test coverage! Please take a look at the day-of-week field validation I mentioned in the comment.