pantsbuild / pants / 21462215668

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build and release self-contained Pants scies (#23021)

Plumbs through the most recent Pex scie flags for completeness and then
uses them to build a Pex scie alongside the existing "regular" PEX.
These are intended for early testing, but not to replace scie-pants or
the current distribution model.

To wind way back up, the advantage of building a full scie as part of
the Pants release:
* Easier major Python version upgrades instead of two step release
dance.
* We can push out Python bugfix/security releases and control the
minimum PBS version (ex: to pick up security updates)
  * Simpler story for certain "no network" use cases..

But how that works with the current distribution model in a backwards
compatible way requires further discussion.

This builds on all of the recent Pex releases that took this from
plausible to possible to easy.

LLM Disclosure: A LLM generated the new test.

ref #22946

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Co-authored-by: SJ <sureshj@gmail.com>

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