[lint] Enforce US spelling

[s3rj1k]

Description

Enables misspell linter and forces US spelling for whole codebase.

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How Has This Been Tested?

• Manual test
• Auto test added

Checklist

• My code follows the style guidelines of this project
• My commit messages are signed-off
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[twz123]

All those L vs. double L mismatches, oh my - Can't the US and UK agree on that? 🤣

There are still some double Ls around, it seems:

pkg/component/controller/apiendpointreconciler.go:1: : # github.com/k0sproject/k0s/pkg/component/controller [github.com/k0sproject/k0s/pkg/component/controller.test]
pkg/component/controller/k0scloudprovider_test.go:78:80: suite.cancelled undefined (type *K0sCloudProviderSuite has no field or method cancelled)
pkg/component/controller/k0scloudprovider_test.go:100:19: suite.cancelled undefined (type *K0sCloudProviderSuite has no field or method cancelled) (typecheck)
/*
pkg/component/controller/clusterconfig_test.go:28:2: could not import github.com/k0sproject/k0s/pkg/component/controller (-: # github.com/k0sproject/k0s/pkg/component/controller [github.com/k0sproject/k0s/pkg/component/controller.test]
pkg/component/controller/k0scloudprovider_test.go:78:80: suite.cancelled undefined (type *K0sCloudProviderSuite has no field or method cancelled)
pkg/component/controller/k0scloudprovider_test.go:100:19: suite.cancelled undefined (type *K0sCloudProviderSuite has no field or method cancelled)) (typecheck)
        "github.com/k0sproject/k0s/pkg/component/controller"
        ^