Pants: Add more dependency-related BUILD metadata #5304

Job	Run time
Skip Duplicate Jobs Pre Job	5s
Self-check on Python 3.8 - Python 3.8	7m 44s
Lint Checks (black, flake8, etc.) - Python 3.8	1m 56s
Compile (pip deps, pylint, etc.) - Python 3.8	3m 15s
Pack Tests - Python 3.8	2m 10s
Unit Tests (chunk 1) - Python 3.8	6m 6s
Lint Checks (black, flake8, etc.) - Python 3.9	2m 9s
Integration Tests (chunk 1) - Python 3.8	4m 40s
Unit Tests (chunk 2) - Python 3.8	4m 47s
Compile (pip deps, pylint, etc.) - Python 3.9	3m 39s
Integration Tests (chunk 2) - Python 3.8	5m 30s
Unit Tests (chunk 1) - Python 3.9	6m 23s
Pack Tests - Python 3.9	2m 0s
Unit Tests (chunk 2) - Python 3.9	4m 28s
Integration Tests (chunk 1) - Python 3.9	4m 23s
Integration Tests (chunk 2) - Python 3.9	5m 23s
Slack notification for failed master builds	4s
	1h 4m 42s

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