in_podman_metrics: Added remove_stale_counters opt #8302

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	12m 15s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	12m 14s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	11m 33s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	11m 53s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	19m 28s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	12m 26s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	19m 13s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	19m 29s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	11m 53s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	11m 43s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	51m 14s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	18m 27s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	17m 59s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	18m 48s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	11m 38s
run-macos-unit-tests (-DFLB_JEMALLOC=Off)	10m 55s
run-macos-unit-tests (-DFLB_SANITIZE_MEMORY=On)	9m 46s
run-macos-unit-tests (-DFLB_SANITIZE_THREAD=On)	10m 35s
Unit tests (matrix)	1s
	4h 51m 30s

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