execution: deduplicate BuiltBlock and AssembledBlock (#20274) #23

Job	Run time
caplin / tests-windows (windows-2025)	3m 8s
caplin / tests (ubuntu-24.04)	4m 44s
repro / reproducible-build (ubuntu-24.04)	4m 15s
repro / reproducible-build (macos-15)	6m 23s
tests / tests-mac-linux (macos-15)	25m 3s
sonar / sonar	12m 54s
repro / reproducible-build (windows-2025)	9m 51s
tests / tests-mac-linux (windows-2025)	32m 7s
bench / benchmarks	10m 17s
tests / tests-mac-linux (ubuntu-24.04)	18m 19s
kurtosis / assertoor_regular_test	5m 19s
kurtosis / assertoor_pectra_test	5m 56s
race-tests / load-matrix	9s
race-tests / tests-linux (ubuntu-latest, execution-eest-blockchain)	14m 59s
race-tests / tests-linux (ubuntu-latest, execution-tests)	20m 50s
race-tests / tests-linux (ubuntu-latest, core-rpc)	8m 43s
race-tests / tests-linux (ubuntu-latest, other)	6m 58s
race-tests / tests-linux (ubuntu-latest, execution-eest-devnet)	16m 42s
race-tests / tests-linux (ubuntu-latest, execution-other)	10m 4s
race-tests / tests-linux (ubuntu-latest, consensus)	6m 14s
	3h 42m 55s

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