Pants: Add BUILD metadata for integration tests #5522

Job	Run time
Skip Duplicate Jobs Pre Job	5s
Self-check on Python 3.8 - Python 3.8	7m 43s
Unit Tests (chunk 1) - Python 3.8	6m 7s
Pack Tests - Python 3.8	2m 45s
Unit Tests (chunk 2) - Python 3.8	4m 37s
Integration Tests (chunk 1) - Python 3.8	5m 14s
Unit Tests (chunk 1) - Python 3.9	6m 19s
Lint Checks (black, flake8, etc.) - Python 3.8	2m 41s
Integration Tests (chunk 2) - Python 3.8	5m 54s
Unit Tests (chunk 2) - Python 3.9	5m 0s
Compile (pip deps, pylint, etc.) - Python 3.8	3m 58s
Pack Tests - Python 3.9	2m 53s
Lint Checks (black, flake8, etc.) - Python 3.9	2m 55s
Integration Tests (chunk 1) - Python 3.9	5m 14s
Compile (pip deps, pylint, etc.) - Python 3.9	3m 57s
Integration Tests (chunk 2) - Python 3.9	6m 0s
Slack notification for failed master builds	7s
	1h 11m 29s

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