chore: improve plan results message when only Outputs will be changed

pkg/terraform/parser.go

@@ -226,7 +226,7 @@ func (p *PlanParser) Parse(body string) ParseResult { //nolint:cyclop
 	}
 
 	return ParseResult{
-		Result:             result,
+		Result:             refinePlanResult(result),
 		ChangedResult:      changeResult,
 		OutsideTerraform:   outsideTerraform,
 		Warning:            warnings,
@@ -245,6 +245,15 @@ func (p *PlanParser) Parse(body string) ParseResult { //nolint:cyclop
 	}
 }
 
+// It can be difficult to understand if we just cut out a part of
+// Terraform's output, so rewrite the text in a way that users can understand.
+func refinePlanResult(s string) string {
+	if s == "Changes to Outputs:" {
+		return "Only Outputs will be changed."
+	}
+	return s
+}
+
 type MovedResource struct {
 	Before string
 	After  string

pkg/terraform/parser_test.go

@@ -436,7 +436,7 @@ Changes to Outputs:
 			name: "plan output changes only pattern 0.15",
 			body: planOnlyOutputChangesSuccessResult0_15,
 			result: ParseResult{
-				Result:             "Changes to Outputs:",
+				Result:             "Only Outputs will be changed.",
 				HasAddOrUpdateOnly: true,
 				HasDestroy:         false,
 				HasNoChanges:       false,
@@ -454,7 +454,7 @@ state, without changing any real infrastructure.`,
 			name: "plan output changes only pattern with TF_IN_AUTOMATION",
 			body: planOnlyOutputChangesSuccessInAutomationResult,
 			result: ParseResult{
-				Result:             "Changes to Outputs:",
+				Result:             "Only Outputs will be changed.",
 				HasAddOrUpdateOnly: true,
 				HasDestroy:         false,
 				HasNoChanges:       false,