fix(py): make merged pip layer outputs unique per binary

[dzbarsky]

Two binaries in one package can use the same wheel group with different dependencies. Their merge aspects currently declare the same archive, causing Bazel to report conflicting actions. Include the binary target name in the merged archive's directory so each binary retains its own wheel set.

Validation: a new analysis test reproduces the conflict before the fix and passes afterward. The existing merged-layer compression test, buildifier, and git diff --check also pass.

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