feat(testing): allow forcing in_test_environment via env var (#68221)

Enables forcing `in_test_environment` to True via
`SENTRY_IN_TEST_ENVIRONMENT` env var.

This allows invoking pytest via other scripts directly from Python code
via `pytest.main(...)`

Author: Bartek Ogryczak

src/sentry/utils/env.py

@@ -9,7 +9,11 @@
 
 
 def in_test_environment() -> bool:
-    return "pytest" in sys.argv[0] or "vscode" in sys.argv[0]
+    return (
+        "pytest" in sys.argv[0]
+        or "vscode" in sys.argv[0]
+        or os.environ.get("SENTRY_IN_TEST_ENVIRONMENT") in {"1", "true"}
+    )
 
 
 def gcp_project_id() -> str: