[BEAM-3713] Cleanup, remove nosetest references

[benEng]

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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	---			---	---	---

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GitHub Actions Tests Status (on master branch)

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

[codecov]

Codecov Report

Merging #15245 (42b77ea) into master (faac725) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #15245      +/-   ##
==========================================
+ Coverage   83.80%   83.82%   +0.01%     
==========================================
  Files         441      440       -1     
  Lines       59764    59767       +3     
==========================================
+ Hits        50084    50097      +13     
+ Misses       9680     9670      -10     

Impacted Files	Coverage Δ
sdks/python/apache_beam/testing/test_pipeline.py	98.24% <ø> (ø)
sdks/python/apache_beam/io/fileio.py	96.00% <100.00%> (+0.11%)	⬆️
...apache_beam/runners/dataflow/internal/apiclient.py	74.66% <100.00%> (ø)
...ks/python/apache_beam/runners/worker/sdk_worker.py	88.85% <0.00%> (-0.16%)	⬇️
setup.py	0.00% <0.00%> (ø)
test_config.py
...hon/apache_beam/runners/worker/bundle_processor.py	93.51% <0.00%> (+0.24%)	⬆️
...ks/python/apache_beam/runners/worker/data_plane.py	92.42% <0.00%> (+1.81%)	⬆️
sdks/python/apache_beam/utils/interactive_utils.py	90.24% <0.00%> (+2.43%)	⬆️

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[benEng]

Run Java_Examples_Dataflow_Java11 PreCommit

[benEng]

Run Python Dataflow ValidatesContainer

[benEng]

Run Python Dataflow ValidatesRunner

[benEng]

Run Python Dataflow V2 ValidatesRunner

[benEng]

Run XVR_Dataflow PostCommit

[benEng]

Run Python37 WordCountIT Performance Test

[benEng]

Run Java_Examples_Dataflow_Java11 PreCommit

[benEng]

Run Java_Examples_Dataflow PreCommit

[benEng]

Run Python PreCommit

[benEng]

R: @udim
Hi Udi, I made the cleanup in this PR. Some checks are falling, but those are failing on cron jobs too. I think aren't related to these changes.
Could you help me to review this?

[udim]

Run Java_Examples_Dataflow PreCommit

[udim]

Run Python PreCommit

[udim]

Looks good! One comment

[benEng]

Run SQL PreCommit

[udim]

The Java failures are irrelevant to this PR, but the Python precommit is perma-red: https://ci-beam.apache.org/job/beam_PreCommit_Python_Cron/buildTimeTrend

Since this PR may introduce new failures, we need to wait until Python precommit is green before merging.

[udim]

run python precommit

[udim]

run python precommit

[kileys]

Run Java_Examples_Dataflow_Java11 PreCommit

[kileys]

Run Java_Examples_Dataflow PreCommit

[benEng]

run python precommit