Calculate the number of business days (excluding weekends) between two given dates. Count only Monday through Friday, excluding Saturday and Sunday. The calculation is inclusive of the start date but exclusive of the end date.
Examples:
Input: startDate = 2025-01-06 (Monday), endDate = 2025-01-10 (Friday)
Output: 4
Explanation: Monday, Tuesday, Wednesday, Thursday are counted (4 business days)
Input: startDate = 2025-01-03 (Friday), endDate = 2025-01-08 (Wednesday)
Output: 3
Explanation: Friday, Monday, Tuesday are counted (weekend excluded)
Input: startDate = 2025-01-06 (Monday), endDate = 2025-01-06 (Monday)
Output: 0
Explanation: Same date, exclusive end date, so 0 days
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