[CLEAN] Synthetic Benchmark PR #26600 - refactor: Extract schedule determination to seperate fn

[tomerqodo]

Benchmark PR calcom#26600

Type: Clean (correct implementation)

Original PR Title: refactor: Extract schedule determination to seperate fn
Original PR Description:

Summary by cubic

Extracted schedule selection into a dedicated function to simplify getUserAvailability and make timezone fallback logic clearer. No functional changes expected.

• Refactors
  • Added detectEventTypeScheduleForUser to choose schedule and report isDefaultSchedule/isTimezoneSet.
  • Introduced ScheduleWithoutTimeZone and DEFAULT_SCHEDULE_DATA.
  • Simplified timezone resolution, using delegated calendar TZ only when needed.
  • Made GetUserAvailabilityResult explicit and typed _getUserAvailability accordingly.
  • Imported WorkingHoursWithUserId and removed inline schedule logic and redundant debug logging.

^{Written for commit 6bf6b44. Summary will update on new commits.}

Original PR URL: calcom#26600

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