linter(goimports): Mixed import groups (internal before external)

[ivankatliarchuk]

What does it do ?

Make sure our tests compliant with Go imports

Motivation

The correct import in GO should produce standard 3-group layout

  import (
      // 1. stdlib
      "fmt"

      // 2. external
      "k8s.io/apimachinery/pkg/..."

      // 3. internal (local-prefix)
      "sigs.k8s.io/external-dns/..."
  )

More

• Yes, this PR title follows Conventional Commits
• Yes, I added unit tests
• Yes, I updated end user documentation accordingly

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[coveralls]

Pull Request Test Coverage Report for Build 22540787539

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 79.165%

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Totals
Change from base Build 22540459008:	0.0%
Covered Lines:	16057
Relevant Lines:	20283

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💛 - Coveralls