Update application generator to skip target generation in project.json

[tbinna]

Since implementing the project graph API v2, Nx can infer nx-forge tasks from detecting the presence of the manifest.yml file in a project root. Starting from Nx 18 (project Crystal), task inference is enabled by default where possible, so we can update the application generator to skip target generation in project.json files.

The user can still define tasks in project.json files in order to override inferred task, or they can provide extra configuration which will be shallow merged into the inferred task configuration.

[tbinna]

Fixed in with release 5.1.0