Update dev container definitions to use new method for applying script-library contents

[Chuxel]

The build system has a new feature that will automatically update the contents of a folder called library-scripts in definitions. This simplifies Dockerfiles since you no longer need to use curl to download them or worry about a SHA to verify them. See here for details.

This issue tracks updates to definitions to use it:

• container-templates
• alpine
• azure-ansible Update azure-ansible to use common scripts #472
• azure-blockchain Update azure-blockchain to use library-scripts #476
• azure-cli Update rust, bazel, perl, azure-cli, R definitions to use common scripts #473
• azure-functions-dotnetcore-2.1
• azure-machine-learning-python-3
• azure-terraform
• bazel Update rust, bazel, perl, azure-cli, R definitions to use common scripts #473
• codespaces-linux (Codespaces image refactor, add JDK 11, Rust #500)
• dapr-dotnetcore-3.1
• dapr-typescript-node-12
• dart
• debian
• docker-from-docker Update docker-from-docker, kubernetes-helm to use library-scripts approach #474
• docker-from-docker-compose Update docker-from-docker, kubernetes-helm to use library-scripts approach #474
• dotnetcore
• dotnetcore-fsharp
• go
• java
• javascript-node
• jekyll
• kubernetes-helm Update docker-from-docker, kubernetes-helm to use library-scripts approach #474
• perl Update rust, bazel, perl, azure-cli, R definitions to use common scripts #473
• php, php-mariadb
• plantuml
• powershell
• python-3
• python-3-anaconda Update python anaconda/miniconda to use common script #466
• python-3-miniconda Update python anaconda/miniconda to use common script #466
• r Update rust, bazel, perl, azure-cli, R definitions to use common scripts #473
• ruby
• ruby-rails
• ruby-sinatra
• rust Update rust, bazel, perl, azure-cli, R definitions to use common scripts #473
• swift
• ubuntu