Improve validation of SmartREST payloads #6599

Job	Run time
Shellcheck	6s
Check whether Cargo.lock is up to date	1m 33s
Block fixup commits	11s
Filter changes	3s
Spell Check with Typos	8s
Run format checks	5m 38s
Run cargo audit	18s
Run cargo check on MSRV	1m 36s
Run cargo clippy	1m 55s
Sort dependencies	1m 58s
Check for unused dependencies	7m 2s
Run cargo test	10m 46s
nightly / doc	1m 34s
Check markdown	0s
	32m 48s

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