🏗 Clean up build cache on Travis (#22926)

* Remove pip and sauce_connect from Travis cache, remove duplicate stop_sauce_connect script

* Add debugging for remote and e2e jobs

* readd sauce

.travis.yml

@@ -78,10 +78,13 @@ jobs:
         - unbuffer node build-system/pr-check/remote-tests.js
       after_script:
         - build-system/sauce_connect/stop_sauce_connect.sh
+        - ps -ef
     - stage: test
       name: "End to End Tests"
       script:
         - unbuffer node build-system/pr-check/e2e-tests.js
+      after_script:
+        - ps -ef
 cache:
   directories:
     - node_modules
@@ -91,5 +94,4 @@ cache:
     - validator/node_modules
     - validator/nodejs/node_modules
     - validator/webui/node_modules
-    - $HOME/.cache/pip
   yarn: true