Make election behavior mutable to support dynamic behaviour transition #2499

Job	Run time
macOS [UBSAN] [lmdb \| clang]	37m 9s
Linux [UBSAN] [lmdb \| clang]	40m 51s
macOS [ASAN] [lmdb \| clang]	29m 48s
Linux [ASAN] [lmdb \| clang]	37m 22s
macOS [TSAN] [lmdb \| clang]	24m 21s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	38m 28s
macOS [UBSAN] [rocksdb \| clang]	48m 52s
macOS [ASAN] [rocksdb \| clang]	38m 27s
Linux [TSAN] [lmdb \| clang]	40m 48s
Linux [LEAK] [lmdb \| clang]	40m 1s
macOS [TSAN] [rocksdb \| clang]	52m 51s
Linux [UBSAN] [rocksdb \| clang]	47m 22s
Linux [ASAN] [rocksdb \| clang]	52m 40s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	53m 37s
Linux [LEAK] [rocksdb \| clang]	52m 14s
	10h 34m 51s

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