Sorting functions for common use

[llamerada-jp]

No description provided.

[Copilot]

Pull Request Overview

This PR refactors controller code to extract common functionality into reusable utility functions. Despite the title mentioning "sorting functions," this is actually about organizing and generalizing code by extracting duplicate logic into shared functions.

Key Changes

• Extracted createCloneByPV() function to util.go for creating RBD clone images, eliminating code duplication from mantlerestore_controller.go
• Generalized createOrUpdateZeroOutPV/PVC functions into createOrUpdateStaticPV/PVC in mantlebackup_controller.go with parameterized names and components
• Removed slices import from mantlerestore_controller.go (moved to util.go with the extracted function)

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
internal/controller/util.go	Adds new createCloneByPV() helper function to create RBD clone images from PV snapshots, and imports slices and ceph packages
internal/controller/mantlerestore_controller.go	Refactors to use the extracted createCloneByPV() function, simplifying cloneImageFromBackup() and removing duplicate code
internal/controller/mantlebackup_controller.go	Renames and generalizes createOrUpdateZeroOutPV/PVC to createOrUpdateStaticPV/PVC with parameterized inputs for broader reusability

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