cli: Refactor resource drift rendering

internal/command/format/difflanguage_string.go

@@ -0,0 +1,29 @@
+// Code generated by "stringer -type=DiffLanguage diff.go"; DO NOT EDIT.
+
+package format
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[DiffLanguageProposedChange-80]
+	_ = x[DiffLanguageDetectedDrift-68]
+}
+
+const (
+	_DiffLanguage_name_0 = "DiffLanguageDetectedDrift"
+	_DiffLanguage_name_1 = "DiffLanguageProposedChange"
+)
+
+func (i DiffLanguage) String() string {
+	switch {
+	case i == 68:
+		return _DiffLanguage_name_0
+	case i == 80:
+		return _DiffLanguage_name_1
+	default:
+		return "DiffLanguage(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+}