chore: migrate java-spanner to monorepo (#12098) #132

Job	Run time
filter	1m 2s
build(21) except self-service clients	0s
showcase-clirr	-1s
unmanaged_dependency_check	-1s
build(8) for showcase	-1s
dependency_analyzer_unit_test	-1s
build(8) except for gapic-generator-java	-1s
build(25) except self-service clients	-1s
showcase	-1s
build(8) for gapic-generator-java	-1s
build	-1s
gapic-generator-java-bom	-1s
	52s

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