### 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_
return _client
@pytest.fixture(scope="class")
def boto3_session():
    if os.environ.get("TEST_TARGET", "") == "AWS_CLOUD":
        return boto3.Session()
    return boto3.Session(
        
        aws_access_key_id=get_aws_account_id(),
        aws_secret_access_key="__test_key__",
    )
@pytest.fixture(scope="class")
def aws_http_client_factory(boto3_session):
    """
    Returns a factory for creating new ``SigningHttpClient`` instances using a configurable botocore request signer.
    The default signer is a SigV4QueryAuth. The credentials are extracted from the ``boto3_sessions`` fixture that
    transparently uses your global profile when TEST_TARGET=AWS_CLOUD, or test credentials when running against
    LocalStack.
    Example invocations
        client = aws_signing_http_client_factory("sqs")
        client.get("http://localhost:4566/000000000000/my-queue")
    or
        client = aws_signing_http_client_factory("dynamodb", signer_factory=SigV4Auth)
        client.post("...")
    """
    def factory(