Update all stacks to utilise go templating

[Kamran64]

Is your feature request related to a problem? Please describe. Now that go templating is supported in the CLI, we should look to update all stacks to utilise this new feature.

Describe the solution you'd like Use templating across all stacks using the variables defined here: https://appsody.dev/docs/stacks/modify#built-in-templating-variables

[Kamran64]

Stacks required:

• [ ] java-microprofile
• [ ] kitura
• [ ] nodejs
• [ ] nodejs-express
• [ ] nodejs-loopback
• [ ] python-flask
• [ ] starter
• [ ] swift
• [ ] nodejs-functions
• [ ] quarkus
• [ ] rocket
• [ ] rust
• [ ] vertx