### 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_
# buck
        bucket_name = f"testuppercase-{short_uid()}"
        s3_create_bucket(Bucket=bucket_name)
        # key 
        _key = "camelCaseKey"
        s3_client.put_(Bucket=bucket_name, Key=_key, Body="something")
        res = s3_client.get_(Bucket=bucket_name, Key=_key)
        snapshot.match("response", res)
        with 
            s3_client.get_(Bucket=bucket_name, Key="camelcasekey")
        snapshot.match("wrong-case-key", e.value.response)
    @pytest.mark.aws_validated
    def test_s3_download__with_lambda(
        self,
        s3_client,
        s3_create_bucket,
        create_lambda_function,
        lambda_client,
        lambda_su_role,
        logs_client,
    ):
        bucket_name = f"bucket-{short_uid()}"
        function_name = f"func-{short_uid()}"
        key = f"key-{short_uid()}"
        s3_create_bucket(Bucket=bucket_name)
        s3_client.put_(Bucket=bucket_name, Key=key, Body="something..")
        create_lambda_function(
            handler_file=os.path.join(
                os.path.dirname(__file__),