Better handle explicit chunked encoding responses (#15092) #3424

Job	Run time
check_format	1m 34s
x86_64-gnu-test (1.7.3)	35m 47s
x86_64-gnu-test (1.8.2)	35m 52s
x86_64-gnu-test (1.9.2)	33m 59s
x86_64-gnu-test-preview_mt	5m 49s
x86_64-gnu-test (1.10.1)	34m 42s
x86_64-gnu-test (1.11.2)	33m 49s
x86_64-gnu-test (1.12.2)	32m 31s
x86_64-gnu-test (1.13.3)	34m 27s
x86_64-musl-test	38m 57s
x86_64-gnu-test (1.14.0)	35m 54s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	32m 3s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	35m 33s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	37m 11s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	34m 1s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	33m 56s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	36m 0s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	34m 30s
	9h 26m 35s

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