out_stackdriver: add k8s_cluster resource type #8639

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	12m 46s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	12m 26s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	11m 57s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	12m 1s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	12m 6s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	13m 3s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	11m 58s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	12m 22s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	12m 26s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	12m 5s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	43m 43s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	11m 52s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	11m 48s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	12m 32s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	11m 51s
run-macos-unit-tests (-DFLB_JEMALLOC=Off)	10m 58s
run-macos-unit-tests (-DFLB_SANITIZE_MEMORY=On)	11m 46s
run-macos-unit-tests (-DFLB_SANITIZE_THREAD=On)	10m 19s
Unit tests (matrix)	1s
	4h 8m 0s

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