Move linting to separate job.

[williamtheaker]

Currently, each job in the matrix strategy runs golangci-lint, which is slightly inefficient and expensive given the price of macOS runners. This PR moves the lint step to a separate job and defaults to the stable version of Go.

[openshift-ci]

Hi @williamtheaker. Thanks for your PR.

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[cfergeau]

/lgtm

[cfergeau]

/approve

[openshift-ci]

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