Bound the growth of `election_winner_details` set #2215

Job	Run time
Linux [UBSAN] [lmdb \| clang]	40m 13s
Linux [ASAN] [lmdb \| clang]	38m 33s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	41m 16s
macOS [UBSAN] [lmdb \| clang]	22m 49s
Linux [TSAN] [lmdb \| clang]	42m 59s
macOS [ASAN] [lmdb \| clang]	6m 28s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	40m 15s
macOS [TSAN] [lmdb \| clang]	32m 21s
Linux [UBSAN] [rocksdb \| clang]	51m 1s
macOS [UBSAN] [rocksdb \| clang]	33m 45s
Linux [ASAN] [rocksdb \| clang]	54m 48s
macOS [ASAN] [rocksdb \| clang]	42m 16s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	59m 52s
macOS [TSAN] [rocksdb \| clang]	55m 58s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	54m 38s
	10h 17m 12s

Provide feedback