Add Python multi-language guide #28474

Job	Run time
Check GCP variables	17s
Python Unit Tests (macos-latest, 3.9, py39)	10m 44s
Python Wordcount Direct Runner (self-hosted, ubuntu-20.04, main, 3.9)	6m 35s
Python Unit Tests (macos-latest, 3.10, py310)	10m 44s
Python Wordcount Direct Runner (self-hosted, ubuntu-20.04, main, 3.10)	7m 40s
Python Unit Tests (macos-latest, 3.11, py311)	10m 45s
Python Wordcount Direct Runner (self-hosted, ubuntu-20.04, main, 3.11)	7m 17s
Python Unit Tests (macos-latest, 3.12, py312)	10m 45s
Python Wordcount Direct Runner (self-hosted, ubuntu-20.04, main, 3.12)	5m 35s
Python Unit Tests (windows-latest, 3.9, py39)	10m 39s
Python Wordcount Direct Runner (macos-latest, 3.9)	3m 30s
Python Unit Tests (windows-latest, 3.10, py310)	10m 41s
Python Wordcount Direct Runner (macos-latest, 3.10)	3m 1s
Python Unit Tests (windows-latest, 3.11, py311)	10m 36s
Python Wordcount Direct Runner (macos-latest, 3.11)	2m 29s
Python Unit Tests (windows-latest, 3.12, py312)	10m 36s
Python Wordcount Direct Runner (macos-latest, 3.12)	2m 43s
Python Wordcount Direct Runner (windows-latest, 3.9)	3m 1s
Python Wordcount Direct Runner (windows-latest, 3.10)	3m 28s
Python Wordcount Direct Runner (windows-latest, 3.11)	3m 26s
Python Wordcount Direct Runner (windows-latest, 3.12)	3m 23s
Build python source distribution	0s
Python Wordcount Dataflow	0s
	2h 17m 55s

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