Rework `broadcast_block_on_arrival` test #2220

Job	Run time
macOS [UBSAN] [lmdb \| clang]	36m 15s
Linux [UBSAN] [lmdb \| clang]	40m 15s
macOS [ASAN] [lmdb \| clang]	29m 10s
Linux [ASAN] [lmdb \| clang]	38m 41s
macOS [TSAN] [lmdb \| clang]	23m 12s
macOS [UBSAN] [rocksdb \| clang]	24m 24s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	43m 9s
Linux [TSAN] [lmdb \| clang]	39m 26s
macOS [ASAN] [rocksdb \| clang]	43m 20s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	41m 51s
macOS [TSAN] [rocksdb \| clang]	59m 56s
Linux [UBSAN] [rocksdb \| clang]	49m 49s
Linux [ASAN] [rocksdb \| clang]	54m 2s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	55m 28s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	54m 18s
	10h 33m 16s

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