remove redundant 0016-approval-voting-parallel test #21611

Job	Run time
isdraft / isdraft	1s
check-dependency-rules	5s
check-workspace	22s
check-fail-ci	15s
check-markdown	14s
check-readme	3m 16s
preflight / preflight	46s
preflight / ci-versions	54s
test-rust-features	1m 58s
check-rust-feature-propagation	2m 2s
fmt	1m 5s
check-toml-format	1m 7s
check-umbrella	2m 7s
All quick checks passed	1s
	14m 13s

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