Add cargo-llvm-cov test coverage reports in CI #991

Job	Run time
Rust Code Linting	17s
Integration Tests (buildpacks/gradle, builder:24, amd64)	5m 35s
Unit Tests	1m 13s
Integration Tests (buildpacks/jvm, builder:24, amd64)	4m 2s
Integration Tests (buildpacks/maven, builder:24, amd64)	5m 14s
Integration Tests (buildpacks/sbt, builder:24, amd64)	7m 26s
Integration Tests (buildpacks/gradle, builder:24, arm64)	5m 54s
Integration Tests (buildpacks/jvm, builder:24, arm64)	7m 27s
Integration Tests (buildpacks/maven, builder:24, arm64)	5m 37s
Integration Tests (buildpacks/sbt, builder:24, arm64)	7m 55s
Integration Tests (buildpacks/gradle, builder:22, amd64)	5m 16s
Integration Tests (buildpacks/jvm, builder:22, amd64)	4m 8s
Integration Tests (buildpacks/jvm-function-invoker, builder:22, amd64)	4m 12s
Integration Tests (buildpacks/maven, builder:22, amd64)	5m 26s
Integration Tests (buildpacks/sbt, builder:22, amd64)	7m 22s
Integration Tests (buildpacks/gradle, builder:20, amd64)	4m 9s
Integration Tests (buildpacks/jvm, builder:20, amd64)	3m 37s
Integration Tests (buildpacks/maven, builder:20, amd64)	4m 27s
Integration Tests (buildpacks/sbt, builder:20, amd64)	7m 5s
	1h 36m 22s

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