refactor: reword warning

* Trying to make it easier to search for "FAILED" in the CI output to find failed tests.
* Also tried to make the message easier to understand.

build.gradle

@@ -94,7 +94,7 @@ subprojects {
             def retryFailOnPassedAfterRetry = Boolean.parseBoolean(
                     System.getProperty("failOnPassedAfterRetry", "false"));
             if (!retryFailOnPassedAfterRetry)
-                logger.warn("retry: Failed tests are to be retried and considered as passed if the retry passes.")
+                logger.warn("retry: Flaky tests will not make the test run fail because failOnPassedAfterRetry is false.")
 
             failOnPassedAfterRetry = retryFailOnPassedAfterRetry
             maxFailures = Integer.parseInt(System.getProperty("maxFailures", "3"))