The Pants native client which was introduced in pantsbuild#11922 has so far only
been usable in the Pants repo when the `USE_NATIVE_PANTS` environment
variable was set.

To make the native client available to end users, this change begins
distributing the native-client binary in Pants wheels. A corresponding
change in the `scie-pants` repo
(pantsbuild/scie-pants#172) uses the native
client to run `pants`.

To reduce the surface area of `scie-pants` (rather than having it be
responsible for handling the special `75` exit code similar to the
`pants` script integration), this PR also moves to having the
native-client execute its own fallback (via `execv`) to the Pants
entrypoint. In future, the `pantsbuild/pants` `pants` script could also
use that facility (e.g. by specifying a separate `pants_server` bash
script as the entrypoint to use as the `_PANTS_SERVER_EXE`).

----

As originally demonstrated on pantsbuild#11831, the native client is still much
faster than the legacy client. Using
pantsbuild/scie-pants#172, the timings look
like:
```
Benchmark #1: PANTS_NO_NATIVE_CLIENT=true PANTS_SHA=836cceb74e6af042e7c82677f3ceb4927efce20e scie-pants-macos-x86_64 help
  Time (mean ± σ):      1.161 s ±  0.067 s    [User: 830.6 ms, System: 79.2 ms]
  Range (min … max):    1.054 s …  1.309 s    10 runs

Benchmark #2: PANTS_SHA=836cceb74e6af042e7c82677f3ceb4927efce20e scie-pants-macos-x86_64 help
  Time (mean ± σ):     271.0 ms ±  30.6 ms    [User: 8.9 ms, System: 6.9 ms]
  Range (min … max):   241.5 ms … 360.6 ms    12 runs

Summary
  'PANTS_SHA=836cceb74e6af042e7c82677f3ceb4927efce20e scie-pants-macos-x86_64 help' ran
    4.29 ± 0.54 times faster than 'PANTS_NO_NATIVE_CLIENT=true PANTS_SHA=836cceb74e6af042e7c82677f3ceb4927efce20e scie-pants-macos-x86_64 help'
```

Fixes pantsbuild#11831.

pantsbuild#19243)

…9047)"

This reverts commit 0aedb6b.

contains breaking change:
```
Error: 3.20 [ERROR] Failed to load the pants.backend.experimental.javascript.register backend: ImportError("cannot import name 'UserChosenNodeJSResolveAliases' from 'pants.backend.javascript.subsystems.nodejs' (/home/gha/actions-runner1/_work/pants/pants/src/python/pants/backend/javascript/subsystems/nodejs.py)")
Traceback (most recent call last):
  File "/home/gha/actions-runner1/_work/pants/pants/src/python/pants/init/extension_loader.py", line 141, in load_backend
    module = importlib.import_module(backend_module)
  File "/home/gha/.pyenv/versions/3.9.13/lib/python3.9/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 850, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "/home/gha/actions-runner1/_work/pants/pants/src/python/pants/backend/experimental/javascript/register.py", line 9, in <module>
    from pants.backend.javascript.goals import lockfile, tailor, test
  File "/home/gha/actions-runner1/_work/pants/pants/src/python/pants/backend/javascript/goals/lockfile.py", line 9, in <module>
    from pants.backend.javascript import nodejs_project_environment
  File "/home/gha/actions-runner1/_work/pants/pants/src/python/pants/backend/javascript/nodejs_project_environment.py", line 9, in <module>
    from pants.backend.javascript import package_json, resolve
  File "/home/gha/actions-runner1/_work/pants/pants/src/python/pants/backend/javascript/resolve.py", line 9, in <module>
    from pants.backend.javascript import nodejs_project
  File "/home/gha/actions-runner1/_work/pants/pants/src/python/pants/backend/javascript/nodejs_project.py", line 19, in <module>
    from pants.backend.javascript.subsystems.nodejs import NodeJS, UserChosenNodeJSResolveAliases
ImportError: cannot import name 'UserChosenNodeJSResolveAliases' from 'pants.backend.javascript.subsystems.nodejs' (/home/gha/actions-runner1/_work/pants/pants/src/python/pants/backend/javascript/subsystems/nodejs.py)
```