chore: enable thelper linter in golangci-lint (#1386)

It allows us to report errors at the right place in the tests.

There was only one function that was not using the helper.
It has been fixed to use it.

.golangci.yml

@@ -12,6 +12,7 @@ linters:
     - misspell
     - nolintlint
     - revive
+    - thelper
     - staticcheck
     - unused
 

cli/main_test.go

@@ -59,6 +59,8 @@ func TestHomeConfigDir(t *testing.T) {
 }
 
 func setHome(t *testing.T, dir string) {
+	t.Helper()
+
 	homeEnv := "HOME"
 	if runtime.GOOS == "windows" {
 		homeEnv = "USERPROFILE"