### 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_
moto_backend: moto_s3_models.S3Backend, bucket: BucketName
) -> moto_s3_models.FakeBucket:
    
    try:
        return moto_backend.get_bucket(bucket_name=bucket)
    except MissingBucket:
        ex = NoSuchBucket("The specified bucket does not exist")
        ex.BucketName = bucket
        raise ex
def get_key_from_moto_bucket(
    moto_bucket: moto_s3_models.FakeBucket, key: ObjectKey
) -> moto_s3_models.FakeKey:
    fake_key = moto_bucket.keys.get(key)
    if not fake_key:
        ex = NoSuchKey("The specified key does not exist.")
        ex.Key = key
        raise ex
    return fake_key
def _create_invalid_argument_exc(
    message: Union[str, None], name: str, value: str, host_id: str = None
) -> InvalidArgument:
    ex = InvalidArgument(message)
    ex.ArgumentName = name
    ex.ArgumentValue = value
    if host_id:
        ex.HostId = host_id
    return ex
def capitalize_header_name_from_snake_case(header_name: str) -> str:
    return "-".join([part.capitalize() for part in header_name.split("-")])