fix(graphql): flakiness in pruning test #75293

Job	Run time
diff	9s
license-check	1m 10s
test (ubuntu-ghcloud)	24m 45s
test-extra (ubuntu-ghcloud)	10m 0s
simtest	16m 1s
move-auto-formatter-ci-test	0s
windows-build (windows-ghcloud)	37s
cargo-deny (advisories, licenses, bans, ...)	37s
clippy	3m 9s
move-test	0s
rustfmt	26s
cutting a new execution layer	1m 25s
test-extra	0s
test	0s
	58m 19s

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