[WIP][BEAM-12501] Don't attempt graceful shutdown in SubprocessServer on Windows

[TheNeuralBit]

It looks like some gymnastics are required to do the equivalent of sending SIGINT on Windows. This PR opts to just skip the graceful shutdown.

WIP because it's still untested on Windows. I can start a machine to verify manually, but I'd like to find a way to test this continuously (see comment)

ValidatesRunner compliance status (on master branch)

Lang	ULR	Dataflow	Flink	Samza	Spark	Twister2
Go	---			---		---
Java
Python	---			---		---
XLang				---		---

Examples testing status on various runners

Lang	ULR	Dataflow	Flink	Samza	Spark	Twister2
Go	---	---	---	---	---	---	---
Java	---		---	---	---	---	---
Python	---	---	---	---	---	---	---
XLang	---	---	---	---	---	---	---

Post-Commit SDK/Transform Integration Tests Status (on master branch)

Go	Java	Python

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website	Whitespace	Typescript
Non-portable
Portable	---			---	---	---

See .test-infra/jenkins/README for trigger phrase, status and link of all Jenkins jobs.

GitHub Actions Tests Status (on master branch)

See CI.md for more information about GitHub Actions CI.

[codecov]

Codecov Report

Merging #15021 (e2eced9) into master (acc0f76) will decrease coverage by 0.01%.
The diff coverage is 22.22%.

@@            Coverage Diff             @@
##           master   #15021      +/-   ##
==========================================
- Coverage   83.77%   83.76%   -0.02%     
==========================================
  Files         439      439              
  Lines       59049    59052       +3     
==========================================
- Hits        49467    49462       -5     
- Misses       9582     9590       +8     

Impacted Files	Coverage Δ
sdks/python/apache_beam/utils/subprocess_server.py	53.37% <22.22%> (+0.22%)	⬆️
...ks/python/apache_beam/runners/worker/data_plane.py	90.90% <0.00%> (-1.82%)	⬇️
sdks/python/apache_beam/internal/metrics/metric.py	86.17% <0.00%> (-1.07%)	⬇️
sdks/python/apache_beam/transforms/util.py	95.86% <0.00%> (-0.18%)	⬇️
...ks/python/apache_beam/runners/worker/sdk_worker.py	88.85% <0.00%> (-0.16%)	⬇️
...hon/apache_beam/runners/worker/bundle_processor.py	93.94% <0.00%> (+0.12%)	⬆️
sdks/python/apache_beam/utils/interactive_utils.py	90.24% <0.00%> (+2.43%)	⬆️

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[github-actions]

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[github-actions]

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