[DX-3565] remove all unused integration-tests code (#21693)

* remove all unused integration-tests code

* clean up go.mod and go.md

* Fix go.md

Author: Tofel

go.md

@@ -460,10 +460,10 @@ flowchart LR
 	click chainlink/devenv href "https://github.com/smartcontractkit/chainlink"
 	chainlink/devenv/fakes --> chainlink-testing-framework/framework/components/fake
 	click chainlink/devenv/fakes href "https://github.com/smartcontractkit/chainlink"
-	chainlink/integration-tests --> chainlink-testing-framework/havoc
 	chainlink/integration-tests --> chainlink-testing-framework/sentinel
 	chainlink/integration-tests --> chainlink/deployment
 	click chainlink/integration-tests href "https://github.com/smartcontractkit/chainlink"
+	chainlink/load-tests --> chainlink-testing-framework/havoc
 	chainlink/load-tests --> chainlink/integration-tests
 	click chainlink/load-tests href "https://github.com/smartcontractkit/chainlink"
 	chainlink/system-tests/lib --> chainlink-testing-framework/framework/components/dockercompose