fix!(cli): rename env option of inspect command to mode

[chenjiahan]

Summary

Rename the env option of rsbuild inspect command to mode. This is to align with other APIs, such as the mode option of rsbuild.build().

# before
npx rsbuild inspect --env production

# after
npx rsbuild inspect --mode production

Related Links

https://rsbuild.dev/api/javascript-api/instance#rsbuildbuild

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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