docs(proposal): add docs for deletion policy

Signed-off-by: chang.qiangqiang <chang.qiangqiang@immomo.com>

docs/proposals/prevent-removal-managed-resources/README.md

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+---
+title: Prevent removal managed resources
+authors:
+- "@CharlesQQ"
+reviewers:
+- "@RainbowMango"
+- "@XiShanYongYe-Chang"
+- "@chaunceyjiang"
+approvers:
+
+creation-date: 2024-06-27
+
+# prevent removal managed resource
+
+## Summary
+
+A deletion mechanism and its API is provided to prevent cascade resource in member cluster deleted by control plane.
+
+## Motivation
+
+All resources reconciled by the execution controller have a finalizer `karmada.io/execution-controller` added to work object's metedata.
+This finalizer will prevent deletion of work object until the execution controller has a chance to perform pre-deletion cleanup.
+
+However, in some cases, user want to delete resource in control plane but resource in member cluster kept, like `kubectl delete sts xxx --cascade=orphan`, sts is deleted but pods not.
+Karmada have different types of resources, different resource might have different prevent removal process.
+
+1. resource template: clean up the labels/annotations from the resource in member clusters and delete work object.
+2. dependent resource: clean up the labels/annotations from the dependent resource in member clusters,such as configmap/secret,  and then delete work object.
+3. resource which directly generate work object such as namespace/cronfederatedhpa/federaredhpa/federatedresourcequota execute the same strategy as resource template.
+
+### Goals
+- Provides API to prevent delete cascade resource.
+- Provides command line to use feature like `karmadactl orphaningdeletion complete/disable <resource type> <name>`
+
+### Non-Goals/Future Work
+- Other delete policy, like retain work object.
+
+## Proposal
+### User stories
+
+#### Story 1
+
+As an administrator, I want a rollback mechanism during workload migration to Karmada, so that I can revert to the pre-migration state in case of any unexpected situation.
+
+
+## Design Details
+
+### API changes
+- Add Annotation `resourcetemplate.karmada.io/deletionpolicy=complete` for resourcetemplate or other resource which create work object directly.
+- The value of `karmada.io/deletionpolicy` should be enum type for scalability
+    - complete: cleanup the labels/annotation from the resource on member clusters and delete work object.
+
+### Dependencies resource deletion policy follow the main resource
+- dependencies-distributor-controller patch dependencies resource deletion policy, to set deletion policy same as the main resource.
+- user delete dependencies resource
+- execution-controller try to delete workload in member cluster, according to deletion policy decide delete workload or just cleanup labels/annotation then delete work object.
+![Dependencies resource deletion policy](statics/dependencies-resource-deletion-policy.png)
+
+### Add karmadactl orphaning-deletion flag
+- `karmadactl deletionpolicy complete <resource type> <name>` add annotation `karmada.io/deletionpolicy=complete`
+- `karmadactl deletionpolicy disable  <resource type> <name>` remove annotation `karmada.io/deletionpolicy`
+