refactor(examples): migrate all HTTP examples to streamable_http_app() #1455

Job	Run time
checks / pre-commit	37s
checks / readme-snippets	14s
checks / test (3.11, lowest-direct, windows-latest)	2m 56s
checks / test (3.10, lowest-direct, ubuntu-latest)	52s
checks / test (3.10, lowest-direct, windows-latest)	2m 48s
checks / test (3.10, locked, ubuntu-latest)	52s
checks / test (3.11, lowest-direct, ubuntu-latest)	55s
checks / test (3.13, locked, ubuntu-latest)	49s
checks / test (3.13, lowest-direct, ubuntu-latest)	56s
checks / test (3.12, locked, ubuntu-latest)	1m 3s
checks / test (3.13, locked, windows-latest)	2m 27s
checks / test (3.12, locked, windows-latest)	3m 36s
checks / test (3.12, lowest-direct, windows-latest)	4m 45s
checks / test (3.11, locked, windows-latest)	2m 46s
checks / test (3.11, locked, ubuntu-latest)	54s
checks / test (3.14, lowest-direct, windows-latest)	2m 27s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 17s
checks / test (3.10, locked, windows-latest)	2m 12s
checks / test (3.14, locked, ubuntu-latest)	2m 28s
checks / test (3.14, locked, windows-latest)	3m 18s
checks / test (3.13, lowest-direct, windows-latest)	3m 3s
checks / test (3.12, lowest-direct, ubuntu-latest)	58s
all-green	4s
	42m 17s

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