Remove unused JavaScript examples

[jkodroff]

These have been removed from the Registry in pulumi/registry#9407:

1. https://github.com/pulumi/examples/tree/master/aws-js-containers
2. https://github.com/pulumi/examples/tree/master/aws-js-langserve
3. https://github.com/pulumi/examples/tree/master/aws-js-sqs-slack
4. https://github.com/pulumi/examples/tree/master/aws-js-webserver-component
5. https://github.com/pulumi/examples/tree/master/aws-js-webserver
6. https://github.com/pulumi/examples/tree/master/aws-js-s3-folder-component
7. https://github.com/pulumi/examples/tree/master/aws-js-s3-folder
8. https://github.com/pulumi/examples/tree/master/gcp-js-webserver

Once that PR is merged, we should likewise remove from this repository.