feat(cli): load env based on foundry profile

[holic]

closes #3565

I am not in love with this approach because it adds an implicit --profile flag to all our commands, but there's not really another way to do this because

• we need to load the env files before importing commands (due to how debug and other libs use env on import)
• to avoid unnecessarily overriding env vars (like ones passed directly into the command), we have to load env files in order of most-specific to least-specific (which means we need to know the value of the --profile flag ahead of time)

I also don't love mucking with process.argv but we only use it in this file and dotenv already mucks with process.env in the same way, so maybe it's fine.

[changeset-bot]

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