Update contributors/devel/sig-testing/testing-strategy.md

Co-authored-by: Jordan Liggitt <[email protected]>

Author: aojea

contributors/devel/sig-testing/testing-strategy.md

@@ -8,7 +8,7 @@ Prioritize tests based on the testing pyramid, refer to the [Testing Guide](./te
 
 - **Unit Tests:**  The foundation. Fast, isolated, and cover individual components.
 - **Integration Tests:** Verify interactions between components within your subsystem. These are preferred for tests which require cluster components to be run with test-specific configurations.
-- **E2E Tests:**  Test the entire system, including interactions with external dependencies. These are the most expensive and prone to flakiness.
+- **E2E Tests:**  Test the entire system, including interactions with external dependencies. These are the most expensive and prone to flakiness. Every cluster component configuration variant requires a distinct e2e job.
 
 ### CI Job Types