Adopt shared golangci-lint config from sdk-go [main]

[xuezhaojun]

Summary

• Add a make lint target that uses the shared lint scripts from sdk-go, enabling zero-configuration linting that auto-detects Go version and downloads the appropriate golangci-lint v2
• Fix all 13 lint issues found by the shared configuration:
  • goimports (3): Fixed import grouping to follow open-cluster-management.io local-prefix convention across clusterpermission_controller.go, clusterpermission_status_controller.go, main.go, and helper.go
  • revive (2): Removed ALL_CAPS constant naming (VALIDATION_MW_RETRY_INTERVAL was unused, so removed entirely); fixed indent-error-flow in getSubjects()
  • staticcheck QF1008 (3): Simplified r.Client.Create/Update/List to r.Create/Update/List by removing redundant embedded field selector
  • staticcheck QF1003 (2): Converted if/else-if chains to tagged switch statements in helper.go
  • staticcheck SA1019 (2): Replaced deprecated workqueue.RateLimitingInterface and workqueue.DefaultControllerRateLimiter() with typed equivalents
  • unused (1): Removed unused addKnownTypes() function from groupversion_info.go

Test plan

• make lint passes with 0 issues
• go build ./... compiles successfully
• CI pipeline passes

🤖 Generated with Claude Code

[openshift-ci]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.94%. Comparing base (740564a) to head (9280237).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
- Coverage   69.13%   68.94%   -0.19%     
==========================================
  Files           4        4              
  Lines         891      892       +1     
==========================================
- Hits          616      615       -1     
- Misses        242      243       +1     
- Partials       33       34       +1     

Flag	Coverage Δ
unit	68.94% <ø> (-0.19%)	⬇️

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