fix: remove technical debt comments and implement breaking changes

[devin-ai-integration]

Summary

This PR addresses technical debt by implementing breaking changes that were previously marked with TODO comments. The changes include:

1. Date Service Format Aliases: Updated format aliases from shorthand notation (e.g., yMdjm) to explicit formats (e.g., M/d/yy, h:mm a) as indicated by TODO comments. This affects short, medium, shortDate, mediumDate, longDate, fullDate, shortTime, and mediumTime formats.

2. Sort Item Component: Changed EventEmitter<any> to EventEmitter<void> since the emit() call doesn't pass any value.

3. Flyout Instance: Made the constructor parameter componentInstance required instead of optional, removing the deprecation warning.

4. Repeater Service: Removed an outdated TODO comment (the type was already SkyRepeaterExpandModeType, not including string).

Updates since last revision

• Updated test expectations in date.pipe.spec.ts and date.service.spec.ts to match new format output:
  • Changed from 4-digit years (1/1/2000) to 2-digit years (1/1/00)
  • Changed French locale expectations from 2000-01-01 00 h 00 to 1/1/00, 12:00 h

Review & Testing Checklist for Human

• CRITICAL: Verify the 2-digit year format is intentional - dates will now display as 1/1/00 instead of 1/1/2000 for all consumers using short, shortDate, etc.
• CRITICAL: Verify the French locale format change is correct - changed from 2000-01-01 00 h 00 to 1/1/00, 12:00 h (this is a significant change in locale-specific formatting)
• Check if any internal or external code depends on the 4-digit year format for parsing or display
• Verify the EventEmitter<void> change doesn't break consumers that might be subscribing and expecting a value
• Check if any code creates SkyFlyoutInstance without passing componentInstance - this will now be a compile error

Recommended Test Plan:

1. Wait for CI tests to complete and verify all pass
2. Test date formatting in a consuming application with both en-US and fr-CA locales to verify the new formats render correctly
3. Search codebase for new SkyFlyoutInstance to ensure all usages pass the required parameter
4. Verify any date parsing logic doesn't depend on the old 4-digit year format

Notes

• TypeScript compilation was verified locally for affected libraries (datetime, flyout, lists)
• Lint checks passed
• Test expectations were updated to match the new format output - human should verify these expected values are correct
• Some CI checks (risk labels, conventional-title) are failing due to PR metadata, not code issues

Link to Devin run: https://app.devin.ai/sessions/e3d3658a90434b37865e9044c2af4e60
Requested by: @bcmake

[devin-ai-integration]

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