Detect invalid proposer signature on RPC block processing #19961

Job	Run time
Check for 'skip-ci' label	1s
check-msrv	5m 21s
check-code	13m 35s
lockbud	14m 33s
target-branch-check	1s
basic-simulator-ubuntu	13m 57s
cargo-sort	30s
cargo-udeps	7m 50s
beacon-chain-tests	24m 33s
cli-check	6m 54s
debug-tests-ubuntu	5m 57s
compile-with-beta-compiler	14m 58s
ef-tests-ubuntu	8m 45s
execution-engine-integration-ubuntu	7m 55s
fallback-simulator-ubuntu	11m 29s
network-tests	21m 4s
op-pool-tests	17m 58s
release-tests-ubuntu	34m 56s
release-tests-windows	45m 53s
slasher-tests	1m 43s
state-transition-vectors-ubuntu	2m 12s
test-suite-success	6s
	4h 20m 11s

Provide feedback