PackageBundle true increment system

We need a true system which increments the prod bundle, and whose state is not tied to something mutable (CODEBUILD_BUILD_NUMBER). This should be implemented for prod to provide better stability for customers.

The issue names no files, tests, or entry points. Start by locating the PackageBundle implementation and all uses of CODEBUILD_BUILD_NUMBER, then trace how production bundle versions are generated. Done means production uses a stable incrementing system whose state is independent of that mutable build number.

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