fix: update L1 CloudFormation resource definitions by removing outdat…

…ed schema overrides (#31539)

### Reason for this change

We didn't receive automated updates for the following three resources since they had a temporary schema override:

```
AWS::ECS::CapacityProvider
AWS::Lambda::EventSourceMapping
AWS::Lambda::Function
```

This prevented new features like EventSourceMapping tagging or documentation updates to be applied to the AWS CDK.

### Description of changes

Remove the outdated temporary schemas.

### Description of how you validated changes

Manually compared that the current schemas from `@aws-cdk/awscdk-service-spec` are additive compared to the schema overrides. Specifically checked that the features they were added for are now available upstream.

### 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)

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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*