Add organization to metrics table  (#2599)

buildkite/collect_metrics.py

diff --git a/buildkite/collect_metrics.py b/buildkite/collect_metrics.py
index 3a5da43..0c8abb1 100644
--- a/buildkite/collect_metrics.py
+++ b/buildkite/collect_metrics.py
@@ -335,6 +335,7 @@
         "created_at": timestamps.created_at,
         "started_at": timestamps.started_at,
         "pipeline": PIPELINE,
+        "org": ORG,
         "platform": PLATFORM,
         "agent_id": AGENT_ID,
         "branch": BRANCH,

buildkite/collect_metrics_test.py

diff --git a/buildkite/collect_metrics_test.py b/buildkite/collect_metrics_test.py
index 33f622a..bb5534a 100644
--- a/buildkite/collect_metrics_test.py
+++ b/buildkite/collect_metrics_test.py
@@ -168,6 +168,7 @@
         # Setup Environment
         os.environ["BUILDKITE_BUILD_NUMBER"] = "500"
         os.environ["BUILDKITE_PIPELINE_SLUG"] = "test-pipeline"
+        os.environ["BUILDKITE_ORGANIZATION_SLUG"] = "test-org"
 
         # Setup Mocks
         mock_git.return_value = 5  # 5 changed files
@@ -201,6 +202,7 @@
 
         self.assertEqual(row["build_number"], 500)
         self.assertEqual(row["pipeline"], "test-pipeline")
+        self.assertEqual(row["org"], "test-org")
         self.assertEqual(row["changed_files_count"], 5)
         self.assertEqual(row["failed_test_count"], 0)
         self.assertEqual(row.get("queue_duration_s"), 300.0)