Remove hello world packages and documentation #7849

Job	Run time
linter_checks (ubuntu-latest, 3.10.9)	13m 23s
copyright_doc_and_dependencies_check (ubuntu-latest, 3.10.9)	21m 22s
lock_check (ubuntu-latest, 3.10.9)	1m 52s
lock_check (macos-latest, 3.10.9)	3m 30s
gitleaks	31s
lock_check (windows-latest, 3.10.9)	6m 59s
e2e (ubuntu-latest, 3.10.9)	1h 43m 56s
test (ubuntu-latest, 3.8)	10m 45s
test (ubuntu-latest, 3.9)	20m 48s
test (ubuntu-latest, 3.10.9)	17m 15s
test (ubuntu-latest, 3.11)	12m 10s
test (macos-latest, 3.8)	9m 26s
test (macos-latest, 3.9)	9m 40s
test (macos-latest, 3.10.9)	11m 15s
test (macos-latest, 3.11)	11m 49s
test (windows-latest, 3.8)	10m 38s
test (windows-latest, 3.9)	9m 15s
test (windows-latest, 3.10.9)	7m 49s
test (windows-latest, 3.11)	6m 24s
	4h 48m 47s

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