Use testify assertions in pkg/errorutil/errors_test.go for consistent table-test failures

[Copilot]

pkg/errorutil/errors_test.go used manual t.Errorf checks while the same package already uses testify assertions in sibling tests. This PR aligns assertion style across errorutil and improves failure readability in table-driven subtests.

• Assertion style alignment

  • Added github.com/stretchr/testify/assert import in pkg/errorutil/errors_test.go.
  • Replaced all manual equality checks (if got != tt.want { t.Errorf(...) }) with assert.Equal(...).

• Scope of updates

  • Updated all three table-driven test suites:
    • TestIsNotFoundError
    • TestIsForbiddenError
    • TestIsGoneError
  • Included descriptive assertion messages with subtest context via tt.name.

• Representative change

  got := errorutil.IsForbiddenError(tt.err)
  assert.Equal(t, tt.want, got, "IsForbiddenError result mismatch for subtest %s", tt.name)

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