fix: add formatPeriodFull method for different date formatting in insights (calcom#22202)

* feat: add formatPeriodStraightforward method for comprehensive date formatting

- Add new formatPeriodStraightforward method that always shows full date information
- Update DateRange interface to include formattedDateStraightforward field
- Modify getDateRanges to generate both formatted versions
- Add comprehensive unit tests for the new straightforward formatting
- Maintain backward compatibility with existing formatPeriod method

Co-Authored-By: eunjae@cal.com <hey@eunjae.dev>

* refactor: rename formatPeriodStraightforward to formatPeriodFull

- Rename method from formatPeriodStraightforward to formatPeriodFull
- Rename interface field from formattedDateStraightforward to formattedDateFull
- Update all test cases to use new method name
- All tests continue to pass with new naming

Co-Authored-By: eunjae@cal.com <hey@eunjae.dev>

* test: add comprehensive getDateRanges formatting comparison tests

- Add 7 new test cases that call getDateRanges directly
- Demonstrate side-by-side comparison of formattedDate vs formattedDateFull
- Cover daily, weekly, and monthly view formatting differences
- Include real-world usage examples showing practical benefits
- All 65 tests pass including new formatting comparison tests

Co-Authored-By: eunjae@cal.com <hey@eunjae.dev>

* refactor: extract formattedDate arrays in getDateRanges comparison tests

- Refactor all 6 tests in 'getDateRanges - Formatting Comparison' suite
- Extract formattedDate and formattedDateFull arrays separately
- Use clean expect statements for easier visual review
- Remove startDate/endDate checks as requested
- Maintain all existing test scenarios and expected values

Co-Authored-By: eunjae@cal.com <hey@eunjae.dev>

* clean up

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Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Benny Joo <sldisek783@gmail.com>

Author: 3 people