fix: normalize indentation in owlbot yamls for new libraries #19059

Job	Run time
gapic-libraries-bom	18m 17s
windows	2m 18s
lint	2m 25s
generation-config-check	1m 41s
enforcer	18m 25s
bulk-filter	1m 3s
changes	5s
split-units (sdk-platform-java, 8)	3m 1s
split-units (sdk-platform-java, 17)	6m 11s
split-units (sdk-platform-java, 21)	6m 38s
split-units (sdk-platform-java, 11)	6m 49s
split-units (sdk-platform-java, 25)	6m 48s
units (8)	59s
units (21)	40s
units (25)	40s
units (11)	34s
units (17)	36s
	1h 17m 10s

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