Update golangci-lint to v1.55.2

[fanny-jiang]

What does this PR do?

• Bump golangci-lint to v1.55.2 to support go v1.21
• Fix linter errors
• Disable deprecated linters (deadcode, structcheck, varcheck)
• Disable unparam and depguard linters

Motivation

Building the kubectl-eds plugin was broken in go v1.21

Additional Notes

• Disabled unparam linter to suppress is always nil error from the EDS controller function updateInstanceWithCurrentRS which returns a nil reconcile.Result{}. Called here https://github.com/DataDog/extendeddaemonset/blob/b53e1cdba19da5b87ae2d6f90eeb6afe1764b7d7/controllers/extendeddaemonset/controller.go#L151
• Disabled depguard linter to allow package imports

Describe your test plan

Write there any instructions and details you may have to test your PR.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (5d93a41) 63.10% compared to head (9226772) 63.10%.

Additional details and impacted files

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