chore: untangling auth library parent and imported BOM #18983

Job	Run time
gapic-libraries-bom	18m 52s
bulk-filter	1m 5s
changes	4s
windows	2m 23s
lint	2m 35s
generation-config-check	1m 39s
enforcer	19m 30s
split-units (sdk-platform-java, 8)	2m 50s
split-units (sdk-platform-java, 21)	7m 7s
split-units (sdk-platform-java, 17)	7m 7s
split-units (sdk-platform-java, 11)	7m 5s
split-units (sdk-platform-java, 25)	6m 15s
units (8)	36m 5s
units (17)	37m 58s
units (25)	34m 0s
units (21)	31m 56s
units (11)	34m 19s
	4h 10m 50s

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