Temporary work around nullptr seqno_to_time_mapping in FlushJob #3835

Job	Run time
build-linux	17m 0s
build-linux-cmake-with-benchmark	20m 1s
build-linux-cmake-with-folly	28m 45s
build-linux-cmake-mingw	12m 35s
build-linux-encrypted_env-no_compression	16m 3s
build-linux-cmake-with-folly-coroutines	31m 48s
build-linux-make-with-folly	28m 38s
build-linux-make-with-folly-lite-no-test	9m 38s
check-format-and-targets	28s
build-examples	10m 57s
build-fuzzers	8m 39s
build-linux-clang10-clang-analyze	17m 26s
build-linux-clang-13-no_test_run	7m 12s
build-linux-clang-no_test_run	12m 0s
build-linux-cmake-with-folly-lite-no-test	8m 8s
build-linux-gcc-10-cxx20-no_test_run	10m 9s
build-linux-gcc-11-no_test_run	10m 31s
build-linux-gcc-8-no_test_run	9m 10s
build-linux-release	15m 27s
build-linux-release-rtti	12m 25s
build-linux-unity-and-headers	13m 23s
build-linux-clang10-asan	17m 23s
build-linux-clang10-ubsan	17m 0s
build-linux-clang13-mini-tsan	24m 31s
build-linux-java	15m 38s
build-linux-mini-crashtest	29m 35s
build-linux-static_lib-alt_namespace-status_checked	19m 15s
build-linux-java-static	11m 59s
build-macos	17m 45s
build-windows-vs2019	55m 0s
build-macos-cmake (true)	55m 25s
build-macos-cmake (false)	43m 8s
build-linux-arm	14m 20s
build-linux-java-pmd	12m 2s
build-macos-java	14m 31s
build-macos-java-static	22m 17s
build-macos-java-static-universal	23m 51s
	11h 34m 3s

Provide feedback