fix(pm): drain pipeline worker tasks #72

Job	Run time
build-linux	3m 23s
build-mac-arm64	5m 46s
build-windows	5m 56s
build-mac-x64	3m 4s
utoopm-e2e-macos-latest-x86_64-apple-darwin	13m 54s
utoopm-e2e-ubuntu-latest-x86_64-unknown-linux-gnu	2m 59s
pm-bench-pcap-linux	-1s
pm-bench-all-linux	-1s
bench-phases-linux	-1s
utoopm-e2e-macos-latest-aarch64-apple-darwin	3m 52s
bench-phases-mac	0s
pm-bench-all-mac	0s
utoopm-e2e-windows-latest-x86_64-pc-windows-msvc	11m 19s
utoopm-e2e-success	2s
	50m 12s

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