Optimise no-op PATCH ops in VC HTTP API #14932

Job	Run time
beacon-chain-tests	19m 30s
release-tests-ubuntu	19m 44s
target-branch-check	1s
debug-tests-ubuntu	13m 23s
network-tests	17m 1s
op-pool-tests	19m 51s
release-tests-windows	25m 19s
slasher-tests	5m 24s
dockerfile-ubuntu	13m 53s
doppelganger-protection-test	21m 15s
ef-tests-ubuntu	16m 33s
eth1-simulator-ubuntu	27m 3s
execution-engine-integration-ubuntu	13m 16s
merge-transition-ubuntu	28m 25s
no-eth1-simulator-ubuntu	28m 1s
state-transition-vectors-ubuntu	11m 13s
syncing-simulator-ubuntu	22m 18s
cargo-udeps	6m 24s
check-code	10m 2s
check-msrv	4m 46s
cli-check	18m 31s
compile-with-beta-compiler	13m 23s
test-suite-success	4s
	5h 55m 20s

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