feat: add minimum cancellation notice for bookings

[deepshekhardas]

Adds a field to limit when people can cancel/reschedule a meeting. Users can now set a minimum notice period (in minutes) that prevents cancellation/rescheduling within the specified time before the meeting starts.

Changes

• Added field to EventType model
• Created new component with UI for setting notice period (similar to existing reschedule functionality)
• Added server-side validation in cancellation API handler
• Added client-side validation in booking actions and booking details page
• Created utility function

Testing

1. Go to Event Type → Advanced tab → Limits section
2. Toggle "Disable cancelling" and select "When less than X minutes before meeting"
3. Try to cancel a booking within the notice period - should be blocked
4. Try to cancel outside the notice period - should work

Closes calcom#15647

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Summary by cubic

Add a minimum cancellation notice to event types, blocking cancellations within X minutes of the start time. Completes calcom#15647 and pairs with the existing reschedule notice to reduce last‑minute cancellations.

• New Features

  • Added minimumCancellationNotice to EventType and enforced it in the cancel API.
  • New Advanced tab control: set a notice window via Disable Cancelling → “When less than X minutes…”.
  • Booking UI hides/disables cancel action within the notice window.
  • Added isWithinMinimumCancellationNotice utility.

• Migration

  • Adds minimumCancellationNotice Int? to EventType. Run your Prisma migration.

^{Written for commit 2c553e7. Summary will update on new commits.}