(CodePipeline): use source S3 trigger without cloudtrail

### Describe the bug

when using CodePipeline with S3 source:

```
const pipeline = new CodePipeline(this, `Pipeline-dev`, {
selfMutation: true,
pipelineName,
synth: new CodeBuildStep('Synth', {
input: CodePipelineSource.s3(sourceBucket, artifactZipName, {
trigger: S3Trigger.EVENTS
}),
```

the template generated contains the following EventBridge rule:
```
{
"detail-type": ["AWS API Call via CloudTrail"],
"source": ["aws.s3"],
"detail": {...
```

This event pattern is not triggered since the source is wrong. Contacting AWS Support, they told us we need to use the following event source instead:

`"eventSource": ["s3.amazonaws.com"]`

As also mentioned in this documentation https://docs.aws.amazon.com/codepipeline/latest/userguide/create-cloudtrail-S3-source-console.html

Even after upgrading CDK to the latest version, the event source is still not created correctly.

### Expected Behavior

Generate template with correct event source for S3 triggered CodePipeline source:
`"eventSource": ["s3.amazonaws.com"]`

### Current Behavior

Template is generated with wrong source for S3 triggered CodePipeline source:
`"source": ["aws.s3"]`

### Reproduction Steps

use a simple CodePipeline as described here
https://cdkworkshop.com/20-typescript/70-advanced-topics/200-pipelines/3000-new-pipeline.html

and use S3 as source instead, with event based trigger
https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.pipelines.CodePipelineSource.html#static-s3bucket-objectkey-props

### Possible Solution

_No response_

### Additional Information/Context

_No response_

### CDK CLI Version

2.50.0 (build 4c11af6)

### Framework Version

2.50.0

### Node.js Version

16.17.0

### OS

Windows 10

### Language

Typescript

### Language Version

TypeScript (4.6.4)

### Other information

_No response_

Start with the CodePipelineSource.s3 entry point and reproduce the issue using a simple pipeline with an S3 source and event-based trigger. Inspect the generated EventBridge rule; done means its event pattern uses eventSource ["s3.amazonaws.com"] rather than source ["aws.s3"].

Written by the indexing model from the issue text.