Store last version in ref

[TrySound]

Ref #1704

Module scope is preserved across projects and does not invalidate last version. Moved to ref to fix.

Code Review

• hi @istarkov, I need you to do
  • conceptual review (architecture, feature-correctness)
  • detailed review (read every line)
  • test it on preview

Before requesting a review

• made a self-review
• added inline comments where things may be not obvious (the "why", not "what")

Before merging

• tested locally and on preview environment (preview dev login: 5de6)
• updated test cases document
• added tests
• if any new env variables are added, added them to .env.example and the builder/env-check.js if mandatory

[vercel]

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Name	Status	Preview	Updated (UTC)
webstudio-builder	✅ Ready (Inspect)	Visit Preview	Jun 2, 2023 2:11pm