Currently within metrics we cannot distinguish between Bazel-involved
configurations:
Bazel as Ninja vs Ninja as Ninja builds
Bazel mixed builds vs non-mixed builds
Add these to the build configuration in order to distinguish between and
track them independently.
Test: go soong tests
Test: USE_BAZEL_ANALYSIS=1 m nothing and verify out/soong_metrics
Bug: 193672397
Change-Id: I94ce56c1a98a76d929598d9fe3070df16ffa1376
ca9cb2e5bd