CI: Running Redis integration tests without grabpl (#63028)

This restores some changes from
https://github.com/grafana/grafana/pull/61920 that were accidentally
deleted.

scripts/drone/steps/lib.star

@@ -1142,7 +1142,8 @@ def redis_integration_tests_step():
         },
         "commands": [
             "dockerize -wait tcp://redis:6379/0 -timeout 120s",
-            "./bin/grabpl integration-tests",
+            "go clean -testcache",
+            "go list './pkg/...' | xargs -I {} sh -c 'go test -run Integration -covermode=atomic -timeout=5m {}'",
         ],
     }