feat: add rrHostSubsetIds to reschedule booking endpoint

[ThyMinimalDev]

What does this PR do?

Adds rrHostSubsetIds support to the reschedule booking endpoint (POST /v2/bookings/:bookingUid/reschedule), matching the existing implementation in the create booking endpoint.

This allows API consumers to specify a subset of round-robin hosts when rescheduling a booking, enabling them to control which hosts are considered for the rescheduled booking.

Changes

1. Added rrHostSubsetIds optional property to RescheduleBookingInput_2024_08_13 with proper validation decorators (@IsArray, @IsInt)
2. Updated transformInputRescheduleBooking to pass through rrHostSubsetIds to the booking handler
3. Added e2e test that validates rescheduling with rrHostSubsetIds to force a different host

The implementation mirrors the existing pattern in CreateBookingInput_2024_08_13.

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. N/A - property is hidden from API docs via @ApiHideProperty().
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

1. Create a round-robin team event type with multiple hosts
2. Create a booking for that event type with rrHostSubsetIds containing one host
3. Reschedule the booking via API with rrHostSubsetIds containing a different host
4. Verify the rescheduled booking is assigned to the new specified host

The e2e test should reschedule a team RR booking and use rrHostSubsetIds to force teamUser2 as host in team-bookings.e2e-spec.ts validates this flow.

Checklist

• My code follows the style guidelines of this project
• I have checked if my changes generate no new warnings

Human Review Checklist

• Verify that the downstream booking handler (handleNewBooking) properly uses rrHostSubsetIds during reschedule operations
• Confirm validation decorators match the create booking endpoint pattern
• Review e2e test coverage for edge cases

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Link to Devin run: https://app.devin.ai/sessions/597820cc9cef4eb688548701f95063a5
Requested by: @ThyMinimalDev

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