chore: rm execution requests from v4 payload fn #1322

Job	Run time
doctest	1m 3s
docs	19s
cfg-check	16s
examples	11s
feature-checks	2m 23s
feature-powerset	3m 12s
clippy	57s
fmt	12s
no-std	39s
test stable --no-default-features	58s
wasm-wasi	41s
wasm-unknown	52s
test stable	59s
test stable --all-features	1m 23s
test nightly --no-default-features	27s
test nightly	43s
test nightly --all-features	57s
test 1.81 --no-default-features	1m 2s
test 1.81	1m 2s
	18m 16s

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