chore: remove usage of script to install golangci-lint

[richardcase]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Remove usage of script to install golangci-lint

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #4366

Special notes for your reviewer:

Checklist:

• squashed commits
• includes documentation
• adds unit tests
• adds or updates e2e tests

Release note:

NONE

[richardcase]

/retitle chore: remove usage of script to install golangci-lint

[enxebre]

/lgtm

[Skarlso]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Skarlso

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• OWNERS [Skarlso]

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[richardcase]

/cherrypick release-2.1

[k8s-infra-cherrypick-robot]

@richardcase: once the present PR merges, I will cherry-pick it on top of release-2.1 in a new PR and assign it to you.

In response to this:

/cherrypick release-2.1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[k8s-infra-cherrypick-robot]

@richardcase: new pull request created: #4368

In response to this:

/cherrypick release-2.1

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.