### 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_resource.Object(s3_bucket, "/foo").put(Body="foobar")
        s3_resource.Object(s3_bucket, "bar").put(Body="barfoo")
        s3_resource.Object(s3_bucket, "/bar/foo/").put(Body="test")
        with 
            s3_resource.Object(s3_bucket, "foo").get()
        e.match("NoSuchKey")
        with 
            s3_resource.Object(s3_bucket, "/bar").get()
        e.match("NoSuchKey")
        response = s3_resource.Object(s3_bucket, "/foo").get()
        assert response["Body"].read() == b"foobar"
        response = s3_resource.Object(s3_bucket, "bar").get()
        assert response["Body"].read() == b"barfoo"
        response = s3_resource.Object(s3_bucket, "/bar/foo/").get()
        assert response["Body"].read() == b"test"
    @pytest.mark.aws_validated
    def test_metadata_header_character_decoding(self, s3_client, s3_bucket, snapshot):