[package-alt] consolidate environment determination on the sui side

[mdgeorge4153]

Description

We now use the same code everywhere to determine the environment to use for package loading/building:

• check for an explicit environment name
• try the CLI's active environment name
• get the chain ID from the cache or the network or the manifest file (using the active CLI env name)
• try to find a matching environment

This should apply everywhere we invoke the package system on the sui side.

Test plan

shell tests

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Release notes

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• Protocol:
• Nodes (Validators and Full nodes):
• gRPC:
• JSON-RPC:
• GraphQL:
• CLI:
• Rust SDK:
• Indexing Framework:

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Project	Deployment	Preview	Comments	Updated (UTC)
sui-docs	Ready	Preview	Comment	Dec 6, 2025 1:57pm

2 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
multisig-toolkit	Ignored	Preview		Dec 6, 2025 1:57pm
sui-kiosk	Ignored	Preview		Dec 6, 2025 1:57pm