[FR]: Make freeze logic on install more convenient to end users

[Aghassi]

What is the current behavior?

Currently, a user must export ASPECT_RULES_JS_FROZEN_PNPM_LOCK to enable update_pnpm_lock failures on CI for non frozen installs.

Describe the feature

Instead of having the users of this rule know a magic variable, just check for a common one like CI so that this works out of box without confusing the end user. A great package for simplifying this check is https://www.npmjs.com/package/env-ci which will do all the necessary checks for you.

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