Upgrade golangci-lint from v1 to v2

[sebrandon1]

Summary

• Upgrade golangci-lint from v1.57.2 to v2.0.2
• Update module path to include /v2/ prefix
• Add minimal .golangci.yml with v2 format declaration

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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[yevgeny-shnaidman]

/lgtm

[yevgeny-shnaidman]

/bypass verified

[yevgeny-shnaidman]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sebrandon1, yevgeny-shnaidman

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[yevgeny-shnaidman]

/verified skip

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[yevgeny-shnaidman]

/verified bypass

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[sebrandon1]

Thanks!