Record initial metrics in build_test_suites

Record initial metrics for analysis time and packaging time in
build_test_suites. Per-target metrics will be reported after initial
test discovery agent integration.

Test: atest build_test_suites_test && atest optimized_targets_test
Bug: 372973116
Change-Id: Id3711ce078bfbfdc4c264a29751c475b4bd0cebd