Unify handling of `process_proposal` outcomes in `finalize_block` #1290

Job	Run time
build-wasm (wasm, build-wasm-scripts, wasm/tx_.wasm wasm/vp_.wasm wasm/checksums.json )	5s
changelog	18s
build-wasm (wasm-for-tests, build-wasm-tests-scripts, wasm_for_tests/*.wasm)	5s
check-packages	1s
build-binaries	4s
lints	6s
rust-docs	4s
test-integration	1s
test-unit	1s
test-wasm	1s
check-benchmarks	1s
test-e2e-with-device-automation	1s
test-e2e	1s
upload-coverage	1s
	50s

Provide feedback