fix(scheduler-targets-alpha): incorrect validation of maximumEventAge (#32284)

### Issue # (if applicable)

N/A

### Reason for this change

The minimum value of `MaximumEventAgeInSeconds` of RetryPolicy is 60 seconds.
https://docs.aws.amazon.com/ja_jp/AWSCloudFormation/latest/UserGuide/aws-properties-scheduler-schedule-retrypolicy.html

`renderRetryPolicy()` currently throws an error when `maxEventAge` is less than 15 minutes.

### Description of changes

Fixed the minimum value of `maxEventAge` to 1 minute. JSDoc is already correct.

### Description of how you validated changes

Fixed unit tests for maxEventAge.
Fixed a lambda integ test to specify maxEventAge to 1 minute.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

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

Author: Tietew

packages/@aws-cdk/aws-scheduler-targets-alpha/lib/target.ts

@@ -154,15 +154,15 @@ export abstract class ScheduleTargetBase {
 
   private renderRetryPolicy(maximumEventAge: Duration | undefined, maximumRetryAttempts: number | undefined): CfnSchedule.RetryPolicyProperty {
     const maxMaxAge = Duration.days(1).toSeconds();
-    const minMaxAge = Duration.minutes(15).toSeconds();
+    const minMaxAge = Duration.minutes(1).toSeconds();
     let maxAge: number = maxMaxAge;
     if (maximumEventAge) {
       maxAge = maximumEventAge.toSeconds({ integral: true });
       if (maxAge > maxMaxAge) {
         throw new Error('Maximum event age is 1 day');
       }
       if (maxAge < minMaxAge) {
-        throw new Error('Minimum event age is 15 minutes');
+        throw new Error('Minimum event age is 1 minute');
       }
     };
     let maxAttempts = 185;

packages/@aws-cdk/aws-scheduler-targets-alpha/test/codebuild-start-build.test.ts

@@ -493,16 +493,16 @@ describe('codebuild start build', () => {
       })).toThrow(/Maximum event age is 1 day/);
   });
 
-  test('throws when retry policy max age is less than 15 minutes', () => {
+  test('throws when retry policy max age is less than 1 minute', () => {
     const codebuildProjectTarget = new CodeBuildStartBuild(codebuildProject, {
-      maxEventAge: Duration.minutes(5),
+      maxEventAge: Duration.seconds(59),
     });
 
     expect(() =>
       new Schedule(stack, 'MyScheduleDummy', {
         schedule: expr,
         target: codebuildProjectTarget,
-      })).toThrow(/Minimum event age is 15 minutes/);
+      })).toThrow(/Minimum event age is 1 minute/);
   });
 
   test('throws when retry policy max retry attempts is out of the allowed limits', () => {

packages/@aws-cdk/aws-scheduler-targets-alpha/test/codepipeline-start-pipeline-execution.test.ts

@@ -501,16 +501,16 @@ describe('codepipeline start execution', () => {
       })).toThrow(/Maximum event age is 1 day/);
   });
 
-  test('throws when retry policy max age is less than 15 minutes', () => {
+  test('throws when retry policy max age is less than 1 minute', () => {
     const codepipelineTarget = new CodePipelineStartPipelineExecution(codepipeline, {
-      maxEventAge: Duration.minutes(5),
+      maxEventAge: Duration.seconds(59),
     });
 
     expect(() =>
       new Schedule(stack, 'MyScheduleDummy', {
         schedule: expr,
         target: codepipelineTarget,
-      })).toThrow(/Minimum event age is 15 minutes/);
+      })).toThrow(/Minimum event age is 1 minute/);
   });
 
   test('throws when retry policy max retry attempts is out of the allowed limits', () => {

packages/@aws-cdk/aws-scheduler-targets-alpha/test/event-bridge-put-events.test.ts

@@ -587,16 +587,16 @@ describe('eventBridge put events', () => {
       })).toThrow(/Maximum event age is 1 day/);
   });
 
-  test('throws when retry policy max age is less than 15 minutes', () => {
+  test('throws when retry policy max age is less than 1 minute', () => {
     const eventBusTarget = new EventBridgePutEvents(eventBusEventEntry, {
-      maxEventAge: Duration.minutes(5),
+      maxEventAge: Duration.seconds(59),
     });
 
     expect(() =>
       new Schedule(stack, 'MyScheduleDummy', {
         schedule: expr,
         target: eventBusTarget,
-      })).toThrow(/Minimum event age is 15 minutes/);
+      })).toThrow(/Minimum event age is 1 minute/);
   });
 
   test('throws when retry policy max retry attempts is out of the allowed limits', () => {

packages/@aws-cdk/aws-scheduler-targets-alpha/test/inspector-start-assessment-run.test.ts

@@ -508,16 +508,16 @@ describe('schedule target', () => {
       })).toThrow(/Maximum event age is 1 day/);
   });
 
-  test('throws when retry policy max age is less than 15 minutes', () => {
+  test('throws when retry policy max age is less than 1 minute', () => {
     const inspectorTarget = new InspectorStartAssessmentRun(template, {
-      maxEventAge: Duration.minutes(5),
+      maxEventAge: Duration.seconds(59),
     });
 
     expect(() =>
       new Schedule(stack, 'MyScheduleDummy', {
         schedule: expr,
         target: inspectorTarget,
-      })).toThrow(/Minimum event age is 15 minutes/);
+      })).toThrow(/Minimum event age is 1 minute/);
   });
 
   test('throws when retry policy max retry attempts is out of the allowed limits', () => {