Remove hardcoded bucket name from node emitter template

[jhsinger-klotho]

Currently we pass the s3 payload bucket into the template and use that in the file

const payloadBucketPhysicalName = process.env.KLOTHO_S3_PREFIX + '{{.PayloadsBucketName}}';

https://github.com/klothoplatform/klotho-pro/issues/51 started the effort of moving this all to Environment variables so that we can dynamically generate these templates based on the iac created. This allows for proper sanitization and the resources to stay in sync