refactor(examples): migrate all HTTP examples to streamable_http_app() #1450

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	36s
checks / test (3.11, lowest-direct, ubuntu-latest)	50s
checks / test (3.12, locked, ubuntu-latest)	58s
checks / test (3.12, locked, windows-latest)	3m 18s
checks / test (3.11, locked, ubuntu-latest)	54s
checks / test (3.11, locked, windows-latest)	2m 38s
checks / test (3.12, lowest-direct, windows-latest)	3m 50s
checks / test (3.10, locked, ubuntu-latest)	53s
checks / test (3.13, locked, windows-latest)	2m 39s
checks / test (3.10, lowest-direct, ubuntu-latest)	57s
checks / test (3.10, lowest-direct, windows-latest)	2m 40s
checks / test (3.13, lowest-direct, windows-latest)	3m 14s
checks / test (3.13, locked, ubuntu-latest)	50s
checks / test (3.13, lowest-direct, ubuntu-latest)	51s
checks / test (3.10, locked, windows-latest)	2m 34s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 19s
checks / test (3.14, locked, ubuntu-latest)	2m 16s
checks / test (3.11, lowest-direct, windows-latest)	2m 45s
checks / test (3.14, locked, windows-latest)	4m 2s
checks / test (3.14, lowest-direct, windows-latest)	2m 30s
checks / test (3.12, lowest-direct, ubuntu-latest)	55s
all-green	3s
	41m 46s

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