Upgrade golangci-lint from v1 to v2.11.4

[sebrandon1]

Summary

• Upgrade golangci-lint from v1.61.0 to v2.11.4
• Update module path to include /v2/ prefix
• Migrate .golangci.yml to v2 format:
  • Add version: "2" declaration
  • Move formatters (gofmt, goimports) to formatters.enable section
  • Convert issues.exclude-rules to linters.exclusions.rules

Note: This PR may require a corresponding change in the openshift/release repo to update Prow CI configurations, similar to openshift/release#72623

Tracking: redhat-best-practices-for-k8s/telco-bot#49

[karampok]

/approve

@sebrandon1 can you please rebase

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: karampok, sebrandon1

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[sebrandon1]

@karampok Done!

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[karampok]

/lgtm

[karampok]

/verified by ci

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