REFACTOR: Backend template flags rework

[CesarD]

Detailed Description

Refactor some of the current Backend template flags to provide a more concise representation of their usage and include some extra flags to allow more granular control over the projects generated within the solution.

Context

Some of the current Backend template flags are useful but their naming and usage may lead to some confusions and misunderstandings, so it will be helpful to refactor them a bit to provide a more concise representation of their usage. Also, it's a good opportunity to include some extra flags to provide more switches over certain projects within the solution.

Possible Implementation

Each of them can be refactored as follows:

• excludeCommon
  • New name: commonLibraries
  • Default: true
• excludeFilesSupport
  • New name: filesSupport
  • Default: true
• massTransitIntegration
  • Unchanged
• apiGateway
  • Unchanged
• disableAuth
  • New name: auth
  • Default: true
• workerService
  • Unchanged
• keycloakConfig
  • Unchanged
• keycloakRealm
  • Unchanged
• New flag:
  • apiService
  • Default: true
  • Enables/Disables the API service project
• New flag:
  • tests
  • Default: true
  • Enables/Disables all test projects