GA Migrations Python PostCommit Sharding Examples

[fernando-wizeline]

As part of the migration of Precommit and Postcommit Jobs from Jenkins to GA in self-hosted runners, this PR contains:

Migrated workflow job-postcommit-python-examples.yml

The migrated workflows were added to CI.md

DO NOT MERGE until the effort to use self-hosted runners is completed #22703

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• Update CHANGES.md with noteworthy changes.
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To check the build health, please visit https://github.com/apache/beam/blob/master/.test-infra/BUILD_STATUS.md

GitHub Actions Tests Status (on master branch)

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

[codecov]

Codecov Report

Merging #23295 (c1bb678) into master (f7b31eb) will decrease coverage by 0.10%.
The diff coverage is n/a.

❗ Current head c1bb678 differs from pull request most recent head d8a35c9. Consider uploading reports for the commit d8a35c9 to get more accurate results

@@            Coverage Diff             @@
##           master   #23295      +/-   ##
==========================================
- Coverage   73.60%   73.49%   -0.11%     
==========================================
  Files         716      718       +2     
  Lines       95327    95438     +111     
==========================================
- Hits        70165    70144      -21     
- Misses      23866    23993     +127     
- Partials     1296     1301       +5     

Flag	Coverage Δ
python	83.17% <ø> (-0.26%)	⬇️

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

Impacted Files	Coverage Δ
sdks/go/pkg/beam/io/databaseio/writer.go	0.00% <0.00%> (-31.43%)	⬇️
sdks/python/apache_beam/internal/gcp/auth.py	73.33% <0.00%> (-5.34%)	⬇️
sdks/go/pkg/beam/core/state/state.go	80.85% <0.00%> (-2.75%)	⬇️
...ks/python/apache_beam/runners/worker/data_plane.py	87.57% <0.00%> (-1.70%)	⬇️
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	93.30% <0.00%> (-0.38%)	⬇️
sdks/python/apache_beam/transforms/util.py	96.06% <0.00%> (-0.16%)	⬇️
...on/apache_beam/runners/dataflow/dataflow_runner.py	82.87% <0.00%> (-0.14%)	⬇️
...thon/apache_beam/ml/inference/sklearn_inference.py	95.45% <0.00%> (-0.07%)	⬇️
... and 17 more

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