unskip sklearn IT test

[AnandInguva]

Fixes: #21859

Accidentaly, Sklearn IT test got skipped at #22088. Unskip and run it in the postcommit 37 and 39 suite

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[AnandInguva]

Run Python 3.7 PostCommit

[AnandInguva]

Run Python 3.9 PostCommit

[AnandInguva]

R: @tvalentyn @ryanthompson591 @TheNeuralBit

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control

[codecov]

Codecov Report

Merging #22825 (dce531d) into master (c7938fa) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #22825      +/-   ##
==========================================
- Coverage   73.98%   73.98%   -0.01%     
==========================================
  Files         713      713              
  Lines       94048    94048              
==========================================
- Hits        69582    69579       -3     
- Misses      23180    23183       +3     
  Partials     1286     1286              

Flag	Coverage Δ
python	83.51% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdks/python/apache_beam/internal/metrics/metric.py	93.00% <0.00%> (-1.00%)	⬇️
...eam/runners/portability/fn_api_runner/execution.py	92.44% <0.00%> (-0.65%)	⬇️
...hon/apache_beam/runners/worker/bundle_processor.py	93.54% <0.00%> (+0.24%)	⬆️

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[TheNeuralBit]

Should we also unskip pytorch tests? I'm unclear on if they're running somewhere https://github.com/apache/beam/blob/master/sdks/python/apache_beam/ml/inference/pytorch_inference_it_test.py#L63-L67

This still LGTM though, will merge when we get a green CI run

[TheNeuralBit]

Run Python_PVR_Flink PreCommit

[TheNeuralBit]

Run Python 3.7 PostCommit

[TheNeuralBit]

Run Python 3.9 PostCommit