[language-text] Make contexts property required for summarization (Azure#25085)

Author: minhanh-phan

sdk/cognitivelanguage/ai-language-text/review/ai-language-text.api.md

@@ -40,7 +40,7 @@ export interface AbstractiveSummarizationSuccessResult extends TextAnalysisSucce
 
 // @public
 export interface AbstractiveSummary {
-    contexts?: SummaryContext[];
+    contexts: SummaryContext[];
     text: string;
 }
 

sdk/cognitivelanguage/ai-language-text/src/generated/generatedClient.ts

@@ -214,6 +214,13 @@ directive:
     transform: >
       $["x-ms-client-name"] = "includeStatistics";
 
+  - from: swagger-document
+    where: $.definitions.AbstractiveSummary.required
+    transform: >
+      if (!$.find((x) => x === "contexts")) {
+          $.push("contexts");
+      }
+
   - from: swagger-document
     where: $.definitions[*]
     transform: >