What is the reason for the inclusion of delete operations for SAM pipeline in the Cloudformation stack changeset?

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The reason for the inclusion of delete operations for SAM pipeline in the Cloudformation stack changeset is to ensure that all resources and configurations created by the pipeline are properly removed and cleaned up when the pipeline is deleted or updated. This helps to prevent any orphaned or unused resources from being left behind, which can cause security issues and increase costs. Including delete operations in the pipeline also helps to ensure that the pipeline can be easily reproducible and scalable, as any unnecessary or redundant resources can be easily removed.