Drop support for SBT 0.x and clean up build.sbt #2051

Job	Run time
check	4m 40s
bazel	1m 26s
Tests (ubuntu-latest, 21)	7m 47s
bazel_aspect	3m 6s
Maven tests (8)	2m 49s
Docker CLI tests (ubuntu-latest)	5m 4s
Maven tests (21)	2m 53s
Maven tests (17)	2m 48s
Maven tests (11)	2m 54s
Tests (ubuntu-latest, 17)	11m 35s
Tests (ubuntu-latest, 8)	14m 51s
Tests (ubuntu-latest, 11)	15m 39s
	1h 15m 32s

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