in_forward: Handle multiply concatenated gzip payloads #9021

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	12m 35s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	12m 49s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	11m 48s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	12m 15s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	11m 56s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	12m 52s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	12m 7s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	12m 20s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	12m 10s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	12m 24s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	44m 15s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	11m 43s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	11m 49s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	11m 52s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	11m 58s
run-macos-unit-tests (-DFLB_JEMALLOC=Off)	12m 24s
run-macos-unit-tests (-DFLB_SANITIZE_MEMORY=On)	11m 9s
run-macos-unit-tests (-DFLB_SANITIZE_THREAD=On)	11m 53s
Unit tests (matrix)	1s
	4h 10m 20s

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