Restrict to 1 validator slash per block height #7958

Job	Run time
namada-release (ubuntu-latest, 2.4.0, ABCI Release build)	11m 8s
build-wasm (ubuntu-latest, v2, 2.4.0)	4m 39s
upload-wasm (ubuntu-latest, v2, nightly-2024-02-10, 2.4.0)	12s
run-benchmarks (ubuntu-latest, nightly-2024-02-10, 2.4.0, ABCI)	26m 17s
test-unit (ubuntu-latest, nightly-2024-02-10, 2.4.0, ABCI)	19m 33s
test-integration (ubuntu-latest, nightly-2024-02-10, 2.4.0, ABCI)	7m 10s
test-wasm (ubuntu-latest, v2, nightly-2024-02-10, 2.4.0)	8m 23s
namada-e2e (ubuntu-latest, nightly-2024-02-10, 2.4.0, 0.37.2, 1.7.4-namada-beta7, 0)	16m 35s
namada-e2e (ubuntu-latest, nightly-2024-02-10, 2.4.0, 0.37.2, 1.7.4-namada-beta7, 1)	24m 39s
namada-e2e (ubuntu-latest, nightly-2024-02-10, 2.4.0, 0.37.2, 1.7.4-namada-beta7, 2)	24m 21s
namada-e2e (ubuntu-latest, nightly-2024-02-10, 2.4.0, 0.37.2, 1.7.4-namada-beta7, 3)	18m 34s
	2h 41m 31s

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