WIP: Extensions env

[licitdev]

Scope

What's changed:

• Add new EXTENSIONS_ENV_ALLOW_LIST env
• Extensions to useExtensionsEnv instead of useEnv
• Clean process.env
• Add a flag for internal flow operations which has access to the default env

Potential Risks / Drawbacks

• Potential breaking change for projects with extensions that need certain envs
  • Mitigated by allowing all envs by default?

Review Notes / Questions

• PR is WIP
• Whether to clean process.env in useEnv instead of in useExtensionsEnv?

[changeset-bot]

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Latest commit: 6802913

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