[BEAM-9487] [cherry-pick] Various Trigger.may_lose_data fixes

[ibzib]

R: @zhoufek

cherry-pick #15603 onto release branch.

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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 #15745 (8837e1d) into release-2.34.0 (f9c1007) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@                Coverage Diff                 @@
##           release-2.34.0   #15745      +/-   ##
==================================================
+ Coverage           83.49%   83.50%   +0.01%     
==================================================
  Files                 445      445              
  Lines               61195    61186       -9     
==================================================
- Hits                51096    51095       -1     
+ Misses              10099    10091       -8     

Impacted Files	Coverage Δ
sdks/python/apache_beam/transforms/trigger.py	89.86% <100.00%> (+0.47%)	⬆️
...hon/apache_beam/runners/worker/bundle_processor.py	93.39% <0.00%> (-0.13%)	⬇️
...on/apache_beam/runners/dataflow/dataflow_runner.py	82.39% <0.00%> (ø)
...ks/python/apache_beam/runners/worker/sdk_worker.py	89.16% <0.00%> (+0.15%)	⬆️
...hon/apache_beam/runners/direct/test_stream_impl.py	96.26% <0.00%> (+2.23%)	⬆️

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[zhoufek]

LGTM