guides: add onboarding snippets #20289

Job	Run time
setup	1m 10s
notification	6s
specs	1m 10s
scripts	0s
client javascript${{ (((needs.setup.outputs.RUN_GEN_JAVASCRIPT == 'true') && format('@{0}', fromJSON(needs.setup.outputs.JAVASCRIPT_DATA).version)) \|\| '') }}	0s
client csharp@8.0.401	5m 42s
client go@1.23.1	3m 43s
client java@8	4m 14s
client java@11	4m 12s
client java@21	3m 51s
client java@17	3m 55s
client kotlin@17.0.12	6m 49s
client php@8.3	3m 57s
client python@3.8	4m 0s
client python@3.9	3m 53s
client python@3.10	4m 21s
client python@3.11	4m 18s
client python@3.12	4m 22s
client ruby@3.3.5	3m 13s
client scala@17.0.12	7m 53s
client swift@5.9	6m 58s
client kotlin${{ (((needs.setup.outputs.RUN_MACOS_KOTLIN_BUILD == 'true') && format('@{0}', fromJSON(needs.setup.outputs.KOTLIN_DATA).version)) \|\| '') }} macos	0s
codegen	0s
client swift${{ (((needs.setup.outputs.RUN_MACOS_SWIFT_CTS == 'true') && format('@{0}', fromJSON(needs.setup.outputs.SWIFT_DATA).version)) \|\| '') }} macos	0s
check_green	1s
push_and_release	0s
	1h 17m 48s

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