lagu: Add end to end tests

[karlhorky]

TODO

• Upgrade to latest Jest
• Review other CLI tools to develop testing strategy
• Adapt file structure and executable running to more standard approach
• Choose executable spawning strategy
• lagu - failing test (not enough options)
• Write more config values from lagu init (api, ssh)
• Remove reliance on global token for login, logout and other commands (option for token file path?)
• Make yarn execute work again without building first
• Change cwd to fixtures directory
• Figure out a way to deal with changing created times in snapshots
• Add VS Code extension settings and recommendations
• Update CLI GraphQL schema
• General
  • lagu init
  • lagu login
    • Configure local token path
    • Test token
  • lagu logout
• Queries
  • lagu customer
  • lagu environment - add data to GraphQL fixtures
  • lagu project
  • lagu projects

Bonus tasks:

• Figure out how to automate on CI Moved to lagu E2E Tests: Figure out how to automate on CI #495
• Fix binary not being on path for yarn global add @lagoon/lagu (npm i -g @lagoon/lagu works). Linking problem? Moved to lagu: Fix yarn global add #496
• Consolidate command data and configuration Moved to lagu: Consolidate command data and configuration #497
• Mutations (project create / project delete) Moved to lagu: E2E Tests for Commands Calling Mutations #498

[Schnitzel]

looking good @karlhorky, thanks a lot.