Unify handling of `process_proposal` outcomes in `finalize_block` #1289

Job	Run time
build-wasm (wasm, build-wasm-scripts, wasm/tx_.wasm wasm/vp_.wasm wasm/checksums.json )	4m 53s
check-packages	6m 52s
build-wasm (wasm-for-tests, build-wasm-tests-scripts, wasm_for_tests/*.wasm)	4m 14s
changelog	20s
build-binaries	10m 40s
lints	5m 52s
rust-docs	7m 20s
test-unit	10m 55s
test-wasm	7m 54s
test-integration	17m 51s
check-benchmarks	11m 5s
test-e2e-with-device-automation	10m 8s
test-e2e (0)	22m 30s
test-e2e (1)	20m 52s
test-e2e (2)	22m 58s
test-e2e (3)	22m 25s
test-e2e (4)	18m 27s
upload-coverage	14s
	3h 25m 30s

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