Abdul Rahman 77e592502c fix: improve CRON schedule validation and display (#16360)
Fixes multiple issues with CRON schedule input validation and execution
time display.

### Issues Fixed

1. **UTC label placement** - Added "UTC" suffix to specific times (e.g.,
"at 09:30 UTC") but not to interval descriptions (e.g., "every hour")

2. **Upcoming execution time calculation** - Fixed incorrect execution
times for malformed CRON expressions by implementing auto-correction

### Changes

- Created `normalizeCronExpression` utility to standardize cron
expressions before parsing
- Updated `formatTime` to support optional UTC suffix
- Enhanced `getHoursDescription` to append UTC to specific times
- Added comprehensive test coverage (102 tests passing)

### Before

- `"1 /3 * * *"` showed daily executions at same time (incorrect)
- `"9 * * *"` showed same time repeated 3 times (incorrect)
- No UTC labels on schedule descriptions (confusing)

### After

- All malformed expressions auto-corrected and show correct execution
times
- UTC labels clearly indicate timezone for specific times
- User-friendly error messages for truly invalid patterns

Closes #15870
2025-12-09 00:09:11 +05:30
2024-11-06 14:24:07 +01:00
2025-08-07 17:02:12 +02:00
2024-01-10 17:05:23 +01:00
2025-07-08 15:13:02 +02:00
2025-04-16 11:46:37 +02:00

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