fix: do not generate Version.java files by default #18667

Job	Run time
gapic-bom	1m 43s
gitignore_correctness	1m 14s
package_name_check	1m 2s
owlbot-yaml	1m 4s
generate-readme	1m 24s
owlbot-py	1m 22s
root-pom	1m 35s
group_id_check_for_maps_libraries	3m 9s
	12m 33s

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