Flatten NestJS to individual mono packages/service instead of being a fat package with multiple targets.

[fuxingloh]

What would you like to be added:

With #1777 #1778 completed, we can move NestJS from a monolithic one giant package project (nest-apps) into a monorepo with multiple package projects with their own package.json and scripts. Further, we can take advantage of turbo prune to prune workspaces when building their relevant docker image.

Why is this needed:

/triage accepted /area workflow packages

[fuxingloh]

/area apps