### 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_
s3_client.put_(Bucket=s3_bucket, Key="mykey", Body=body)
        response = s3_client.get_(Bucket=s3_bucket, Key="mykey")
        snapshot.match("get-", response)
        response = s3_client.copy_(
            Bucket=s3_bucket,
            CopySource=f"{s3_bucket}/mykey",
            Key="copiedkey",
            BucketKeyEnabled=True,
            SSEKMSKeyId=key_id,
            ServerSideEncryption="aws:kms",
        )
        snapshot.match("copy-", response)
        response = s3_client.get_(Bucket=s3_bucket, Key="copiedkey")
        snapshot.match("get-copied-", response)
    @pytest.mark.aws_validated
    def test_region_header_exists(self, s3_client, s3_create_bucket, snapshot):
        snapshot.add_transformer(snapshot.transform.s3_api())
        bucket_name = s3_create_bucket(
            CreateBucketConfiguration={"LocationConstraint": "eu-west-1"},
        )
        response = s3_client.head_bucket(Bucket=bucket_name)
        assert response["ResponseMetadata"]["HTTPHeaders"]["x-amz-bucket-region"] == "eu-west-1"
        snapshot.match("head_bucket", response)
        response = s3_client.list_s_v2(Bucket=bucket_name)
        assert response["ResponseMetadata"]["HTTPHeaders"]["x-amz-bucket-region"] == "eu-west-1"
        snapshot.match("list_s_v2", response)
    @pytest.mark.aws_validated
    
    @pytest.mark.skip_snapshot_verify(paths=["$..Prefix", "$..list-buckets.Buckets"])
    def test_delete_bucket_with_content(self, s3_client, s3_resource, s3_bucket, snapshot):