refactor: stop reading pnpm_lock from label_store

[dzbarsky]

We should stop using label_store completely; it served a useful purpose to precompute labels when restarts were expensive, but that's no longer true in modern bazels. We can use the labels direcly from rctx.attr and simplify some indirection.

Note that we still touch the label early so even for non-modern bazels this should not be a performance degradation.

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