FAST: add top-level folders and restructure teams/tenants in resman

[ludoo]

• remove the teams and lightweight tenants from resman
• remove multitenant stages
• move fast_features to resman
• support user-defined top-level folders via variable and factory in resman, with optional automation resources
• implement new stage 1 tenant factory, which combines lightweight and hard tenancy
  • verify IAM so that stage 1 can be applied by FAST-compatible tenants
  • add support for CI/CD
  • add support for per-tenant scoped VPC-SC access policy
  • billing IAM for tenants
  • add support for tenant-level WIF providers
• refactor stage 1
  • support folders as root nodes (IAM, tags defined in automation project)
  • add support for log sinks like in stage 0
• apply tests
  • multitenant stage with all types of tenants
  • resman with billing
  • networking stage
  • security stage
• write proper documentation for the stage
• add FAST test

High level stage flow

High level tenant factory stage diagram

Fixes #2128

[gustavovalverde]

Just to be certain, but I suppose that after this change and some other recent refactors, there's no longer a migration path if someone would like to sync their FAST implementation before May 15th, with today changes.

Is there any documentation on how to migrate after each refactor?

[ludoo]

You're right, it needs to be done by hand migrating resources via moved blocks / commands...

[gustavovalverde]

Thank you. I've created this issue as a follow-up for the conversation: #2512