chore(integ-tests): status should be an enum type (#20364)

rosetta infuse has trouble generating an example for `status`. Also,
this should be an enum type anyway.


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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: corymhall

packages/@aws-cdk/integ-tests/lib/assertions/providers/lambda-handler/types.ts

@@ -122,6 +122,21 @@ export interface AssertionResult {
   readonly failed?: boolean;
 }
 
+/**
+ * The status of the assertion
+ */
+export enum Status {
+  /**
+   * The assertion passed
+   */
+  PASS = 'pass',
+
+  /**
+   * The assertion failed
+   */
+  FAIL = 'fail',
+}
+
 /**
  * The result of an assertion
  */
@@ -130,7 +145,7 @@ export interface AssertionResultData {
    * The status of the assertion, i.e.
    * pass or fail
    */
-  readonly status: 'pass' | 'fail'
+  readonly status: Status;
 
   /**
    * Any message returned with the assertion result