Test proper behavior of request aggregator #2480

Job	Run time
macOS [UBSAN] [lmdb \| clang]	39m 16s
Linux [UBSAN] [lmdb \| clang]	39m 26s
macOS [ASAN] [lmdb \| clang]	31m 45s
Linux [ASAN] [lmdb \| clang]	38m 32s
macOS [TSAN] [lmdb \| clang]	34m 5s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	40m 4s
macOS [UBSAN] [rocksdb \| clang]	44m 7s
Linux [TSAN] [lmdb \| clang]	40m 14s
macOS [ASAN] [rocksdb \| clang]	41m 50s
Linux [LEAK] [lmdb \| clang]	39m 5s
macOS [TSAN] [rocksdb \| clang]	46m 28s
Linux [UBSAN] [rocksdb \| clang]	52m 44s
Linux [ASAN] [rocksdb \| clang]	52m 50s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	54m 47s
Linux [LEAK] [rocksdb \| clang]	55m 21s
	10h 50m 34s

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