aws-codestarnotifications: missing dependency on target Topic's TopicPolicy

### Describe the bug

When deploying a stack with an SNS `Topic` and `NotificationRule` for a CodePipeline, it appears the `NotificationRule` will verify that it is able to send messages to the `Topic` and could fail if the `TopicPolicy` has not been deployed yet.

My `TopicPolicy` and `NotifactionRule` were being deployed simultaneously by CloudFormation and the `NotificationRule` deployment failed with error

> Resource handler returned message: "Invalid request provided: AWS::CodeStarNotifications::NotificationRule"

This seems to be caused by `addTarget` in https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-codestarnotifications/lib/notification-rule.ts not adding a dependency to the Topic's policy.

### Expected Behavior

`NotificationRule` is deployed successfully.

### Current Behavior

A race condition caused the NotificationRule deployment to fail if the TopicPolicy happens to not have been deployed yet.

### Reproduction Steps

Cannot be consistently reproduced.

### Possible Solution

In `addTarget`, for each `NotificationRule` target that is a `Topic` that is created in the same stack, add a dependency on the topic's policy.

Workaround, explicitly add the dependency:
```
const topic = new Topic(...);
const rule = new NotificationRule(..., ..., {
...,
targets: [topic]
});
// 'Policy': https://github.com/aws/aws-cdk/blob/v2.132.1/packages/aws-cdk-lib/aws-sns/lib/topic-base.ts#L135
rule.node.addDependency(topic.node.findChild('Policy'));
```

### Additional Information/Context

_No response_

### CDK CLI Version

2.132.1 (build 9df7dd3)

### Framework Version

_No response_

### Node.js Version

v20.10.0

### OS

Windows 10 Version 22H2

### Language

TypeScript

### Language Version

_No response_

### Other information

_No response_

Start in packages/aws-cdk-lib/aws-codestarnotifications/lib/notification-rule.ts and inspect addTarget, then compare how the Topic's Policy child is exposed in packages/aws-cdk-lib/aws-sns/lib/topic-base.ts. Reproduce the same-stack Topic, TopicPolicy, and NotificationRule scenario, and verify that the synthesized deployment orders the NotificationRule after the policy and succeeds.

Written by the indexing model from the issue text.