Upgrade golangci-lint from v1 to v2

[sebrandon1]

Summary

• Upgrade golangci-lint from v1.55.0 to v2.0.2
• Update module path to include /v2/ prefix
• Migrate .golangci.yaml to v2 format:
  • Add version: "2" declaration
  • Move formatters (gofmt, gofumpt, goimports) to formatters.enable section
  • Move linters-settings under linters.settings
  • Convert issues section to linters.exclusions
  • Replace deprecated exportloopref with copyloopvar
  • Remove deprecated execinquery linter

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

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@sebrandon1: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/lint	f04ba45	link	true	/test lint

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