refactor(examples): migrate all HTTP examples to streamable_http_app() #1447

Job	Run time
checks / pre-commit	38s
checks / readme-snippets	12s
checks / test (3.11, lowest-direct, windows-latest)	2m 33s
checks / test (3.10, locked, windows-latest)	2m 57s
checks / test (3.11, lowest-direct, ubuntu-latest)	54s
checks / test (3.10, lowest-direct, windows-latest)	2m 40s
checks / test (3.10, locked, ubuntu-latest)	53s
checks / test (3.10, lowest-direct, ubuntu-latest)	55s
checks / test (3.14, lowest-direct, windows-latest)	2m 22s
checks / test (3.11, locked, windows-latest)	3m 31s
checks / test (3.12, locked, ubuntu-latest)	59s
checks / test (3.13, lowest-direct, ubuntu-latest)	54s
checks / test (3.11, locked, ubuntu-latest)	47s
checks / test (3.14, locked, ubuntu-latest)	2m 48s
checks / test (3.12, lowest-direct, windows-latest)	3m 53s
checks / test (3.13, locked, windows-latest)	2m 28s
checks / test (3.12, locked, windows-latest)	3m 30s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 14s
checks / test (3.13, locked, ubuntu-latest)	49s
checks / test (3.14, locked, windows-latest)	3m 43s
checks / test (3.13, lowest-direct, windows-latest)	2m 41s
all-green	5s
	42m 29s

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