chore: setup release-please to update generator version in generation configuration #6910

Job	Run time
build(8) except for gapic-generator-java	4m 13s
build (11)	12m 58s
build(8) for gapic-generator-java	9m 17s
build (17)	12m 16s
build(21) except self-service clients	12m 6s
dependency_analyzer_unit_test	14s
gapic-generator-java-bom	1m 47s
compatibility	1m 31s
lint	26s
showcase (11)	4m 8s
showcase-clirr	2m 59s
showcase (17)	4m 10s
showcase-native	8m 14s
unmanaged_dependency_check	3m 56s
	1h 18m 15s

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