ci(bom): print full mvn-install.log on pre-install failure #4787

Job	Run time
filter	1m 12s
downstream-compatibility (spring-cloud-gcp)	13m 52s
downstream-compatibility (java-pubsub)	4m 18s
downstream-compatibility (java-bigtable)	8m 23s
downstream-compatibility (java-firestore)	3m 53s
conditional-required-check	2s
	31m 40s

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