…locks) for PCUI

- Added CapacityReservationTarget select component allowing users to choose between CapacityReservationId, CapacityReservationResourceGroupArn, or none at both queue and compute resource levels.
- Implemented dynamic placeholders to guide users on the required inputs for CapacityReservationId and CapacityReservationResourceGroupArn.
- Introduced CAPACITY_BLOCK as a new purchase type option in the UI.
- Automatically hide the Allocation Strategy selection when CAPACITY_BLOCK is selected as the purchase type, adhering to the expected behavior in ParallelCluster.
- Applied CapacityReservationTarget select component in queue and compute resource levels, maintaining consistency with ParallelCluster's behavior.

…locks) for PCUI

- Removed the usage of the odcrCbSelection component at the queue level due to conflicts in queues.mapper.ts when converting SingleInstanceComputeResource to MultiInstanceComputeResource.
- Implemented logic to automatically hide the instance type selection and exclude the Instances section in the YAML when CapacityReservationId is selected.
- Made the Instances property of MultiInstanceComputeResource optional.
- Updated the mechanism in queues.mapper.ts to resolve the conversion conflict.

…ources to adapt the new changes. Now if CapacityReservationId is selected, Instances can be empty.

…documentation links and note on instance type usage. Move related string correctly under compute resources instead of advanced options. Tiny changes on format and comments.