Cleanup Tasks for Release 1.18

[RainbowMango]

Overview

This issue tracks cleanup tasks and deprecation removals that should be addressed in the Karmada Release 1.18. These items were deprecated or marked for removal in previous versions and are candidates for cleanup in this release cycle.

Context

As an open source project, we sometimes need to deprecate features or APIs gradually to minimize breaking changes for users. This issue serves as a central place to track and coordinate all cleanup work that spans multiple release cycles.

Cleanup Items

Remove Deprecated Metrics Labels

• Description: Remove deprecated metric labels
• Deprecation Version: Release 1.16
• Related Issue(s): Standardize Karmada metrics label for member clusters to avoid conflicts with Prometheus external_labels #6781
• Changes Required:
  • Remove deprecated labels from metrics code

Remove Deprecated KarmadaInitConfig Field

• Description: Remove deprecated KarmadaInitConfig Field
• Deprecation Version: Release 1.17
• Related Pull Request(s): depercated: mark KarmadaInitConfig.spec.etcd.local.initImage deprecated #6995
• Changes Required：
  • remove InitImage field from KarmadaInitConfig struct

[zhzhuang-zju]

Add a cleanup Item

Remove Deprecated KarmadaInitConfig Field

• Description: Remove deprecated KarmadaInitConfig Field
• Deprecation Version: Release 1.17
• Related Pull Request(s): depercated: mark KarmadaInitConfig.spec.etcd.local.initImage deprecated #6995
• Changes Required：
  • remove InitImage field from KarmadaInitConfig struct

[RainbowMango]

Added