Threading refactor (3/7): Executor isolation #22

Job	Run time
bulk-filter	1m 17s
enforcer	20m 47s
units (8)	1m 22s
lint	3m 26s
gapic-libraries-bom	20m 55s
changes	1m 16s
generation-config-check	1m 45s
windows	2m 6s
units (11)	1m 12s
units (26)	1m 37s
units (17)	1m 31s
units (25)	40s
units (21)	1m 13s
split-units (java-bigtable, 8)	7m 5s
split-dependencies (java-bigtable)	6m 2s
split-clirr (java-bigtable)	3m 0s
split-units (java-bigtable, 26)	8m 16s
split-units (java-bigtable, 21)	8m 45s
split-units (java-bigtable, 11)	6m 37s
split-units (java-bigtable, 17)	8m 12s
split-units (java-bigtable, 25)	8m 2s
conditional-required-check	3s
	1h 55m 9s

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