Threading refactor (5/7): Close ordering & shutdown hardening #33

Job	Run time
bulk-filter	1m 26s
lint	3m 9s
changes	30s
enforcer	21m 41s
generation-config-check	1m 5s
gapic-libraries-bom	19m 17s
units (8)	2m 14s
windows	2m 16s
units (26)	1m 31s
units (21)	1m 29s
units (11)	42s
units (25)	1m 35s
units (17)	1m 24s
split-dependencies (java-bigtable)	6m 14s
split-units (java-bigtable, 8)	7m 11s
split-clirr (java-bigtable)	3m 24s
split-units (java-bigtable, 25)	6h 0m 17s
split-units (java-bigtable, 21)	9m 0s
split-units (java-bigtable, 11)	7m 4s
split-units (java-bigtable, 26)	8m 37s
split-units (java-bigtable, 17)	8m 53s
conditional-required-check	4s
	7h 49m 3s

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