fix: move nexus plugin to default plugin management #1522

Job	Run time
build (8, java-bigquery, test)	2m 19s
javadoc-with-doclet (java-bigtable)	1m 12s
build (8, java-bigquery, lint)	1m 13s
javadoc-with-doclet (java-bigquery)	1m 5s
build (8, java-bigquery, clirr)	1m 26s
javadoc-with-doclet (java-storage)	1m 33s
build (8, java-bigquery, javadoc)	1m 13s
javadoc-with-doclet (java-storage-nio)	1m 3s
build (8, java-bigquery, javadoc-with-doclet)	1m 9s
javadoc-with-doclet (java-spanner)	1m 48s
build (8, java-bigtable, test)	2m 50s
javadoc-with-doclet (java-spanner-jdbc)	1m 0s
build (8, java-bigtable, lint)	1m 19s
javadoc-with-doclet (java-pubsub)	1m 9s
build (8, java-bigtable, clirr)	1m 23s
javadoc-with-doclet (java-pubsublite)	1m 15s
build (8, java-bigtable, javadoc)	2m 9s
javadoc-with-doclet (java-logging)	1m 2s
build (8, java-bigtable, javadoc-with-doclet)	1m 7s
javadoc-with-doclet (java-logging-logback)	50s
build (11, java-bigquery, test)	2m 46s
javadoc-with-doclet (java-firestore)	1m 13s
build (11, java-bigquery, lint)	1m 25s
javadoc-with-doclet (java-datastore)	1m 42s
javadoc-with-doclet (java-bigquerystorage)	1m 14s
build (11, java-bigquery, clirr)	1m 27s
build (11, java-bigquery, javadoc)	1m 28s
build (11, java-bigquery, javadoc-with-doclet)	54s
build (11, java-bigtable, test)	3m 26s
build (11, java-bigtable, lint)	1m 29s
build (11, java-bigtable, clirr)	1m 28s
build (11, java-bigtable, javadoc)	2m 24s
build (11, java-bigtable, javadoc-with-doclet)	1m 18s
	50m 19s

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