Threading refactor (3/7): Executor isolation #36

Job	Run time
bulk-filter	28s
lint	3m 25s
enforcer	15m 38s
units (8)	1m 59s
generation-config-check	1m 50s
changes	1m 12s
windows	2m 16s
gapic-libraries-bom	19m 51s
units (21)	1m 36s
units (17)	1m 22s
units (11)	1m 29s
units (26)	1m 26s
units (25)	1m 22s
split-units (java-bigtable, 8)	6m 25s
split-dependencies (java-bigtable)	6m 5s
split-clirr (java-bigtable)	3m 0s
split-units (java-bigtable, 25)	8m 45s
split-units (java-bigtable, 17)	8m 36s
split-units (java-bigtable, 11)	6m 26s
split-units (java-bigtable, 26)	8m 14s
split-units (java-bigtable, 21)	8m 59s
conditional-required-check	3s
	1h 50m 27s

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