### 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_
policy_arns = []
    def _create_policy(*args, **kwargs):
        if "PolicyName" not in kwargs:
            kwargs["PolicyName"] = f"policy-{short_uid()}"
        response = iam_client.create_policy(*args, **kwargs)
        policy_arn = response["Policy"]["Arn"]
        policy_arns.append(policy_arn)
        return response
    yield _create_policy
    for policy_arn in policy_arns:
        try:
            iam_client.delete_policy(PolicyArn=policy_arn)
        except Exception:
            LOG.debug("Could not delete policy '%s' during test cleanup", policy_arn)
@pytest.fixture
def create_user(iam_client):
    usernames = []
    def _create_user(**kwargs):