Bound the growth of `election_winner_details` set #2213

Job	Run time
Linux [UBSAN] [lmdb \| clang]	38m 59s
macOS [UBSAN] [lmdb \| clang]	25m 46s
Linux [ASAN] [lmdb \| clang]	39m 27s
macOS [ASAN] [lmdb \| clang]	31m 13s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	42m 11s
macOS [TSAN] [lmdb \| clang]	41m 26s
Linux [TSAN] [lmdb \| clang]	39m 1s
macOS [UBSAN] [rocksdb \| clang]	20m 52s
macOS [ASAN] [rocksdb \| clang]	38m 20s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	39m 41s
macOS [TSAN] [rocksdb \| clang]	47m 37s
Linux [UBSAN] [rocksdb \| clang]	50m 57s
Linux [ASAN] [rocksdb \| clang]	55m 14s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	59m 32s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	54m 52s
	10h 25m 8s

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