in_kubernetes_events: consolidate record timestamp logic #8504

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	12m 20s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	12m 16s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	11m 33s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	11m 31s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	11m 34s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	12m 28s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	11m 42s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	11m 45s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	11m 48s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	11m 37s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	43m 21s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	11m 33s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	11m 41s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	11m 32s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	11m 33s
run-macos-unit-tests (-DFLB_JEMALLOC=Off)	10m 52s
run-macos-unit-tests (-DFLB_SANITIZE_MEMORY=On)	11m 17s
run-macos-unit-tests (-DFLB_SANITIZE_THREAD=On)	10m 52s
Unit tests (matrix)	1s
	4h 1m 16s

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