### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

copyObject and putObject (and perhaps other requests) requests are accepted and do not return an error when an SSE KMS key is specified. 

### Expected Behavior

The error which should be returned is KMS.NotFoundException.

### How are you starting LocalStack?

Custom (please describe below)

### Steps To Reproduce

#### How are you starting localstack (e.g., `bin/localstack` command, arguments, or `docker-compose.yml`)

    Localstack testcontainers 

#### Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

   Call copyObject/putObject via latest version using AWS SDK V2 and specific a ssekmsKeyId.

```java
final var copyObjectRequestBuilder =
        CopyObjectRequest.builder()
            .serverSideEncryption(ServerSideEncryption.AWS_KMS)
            .ssekmsKeyId("NON-EXISTENT KMS KEY")
            .sourceBucket(sourceBucketName)
            .sourceKey(sourceKey)
            .destinationBucket(destinationBucket)
            .destinationKey(destinationKey);
final var copyObjectResponse = sourceRegionS3Client.copyObject(copyObjectRequest); // Error should be thrown here but localstack does not return an error
```

### Environment

```markdown
- OS: MacOS 13.0
- LocalStack: Latest (v1.2.0)
```


### Anything else?

_No response_
def perform_multipart_upload(bucket, key, data=None, zipped=False, acl=None, parts: int = 1):
        
        kwargs = {"ACL": acl} if acl else {}
        multipart_upload_dict = s3_client.create_multipart_upload(Bucket=bucket, Key=key, **kwargs)
        upload_id = multipart_upload_dict["UploadId"]
        data = data or (5 * short_uid())
        multipart_upload_parts = []
        for part in range(parts):
            
            part_number = part + 1
            part_data = data or (5 * short_uid())
            if part_number < parts and ((len_data := len(part_data)) < 5_242_880):
                
                multiple = 5_242_880 // len_data
                part_data = part_data * (multiple + 1)
            part_data = to_bytes(part_data)
            upload_file_ = BytesIO(part_data)
            if zipped:
                upload_file_ = BytesIO()
                with gzip.GzipFile(fileobj=upload_file_, mode="w") as filestream:
                    filestream.write(part_data)
            response = s3_client.upload_part(
                Bucket=bucket,
                Key=key,
                Body=upload_file_,
                PartNumber=part_number,
                UploadId=upload_id,
            )